Squirrel And G-Man Twenty Four Hour Party People Carnt Smile (White Out).............

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I was sitting down, listening to one of my favorite recordings recently...

( slumped in an arm-chair at 2am, would be a more accurate description )

...and the thought of a total refurb. of my analogue sources popped up again.

Could Shaun have a more 'focused' sound-stage ?
Is it possible to match Paul's on-stage bass in the comfort of your own arm-chair ?
What guitar was Mark playing ? ; perhaps an overhaul would make it obvious.
Maybe Gary's drums might sound like 'the Zep's' after a few kickin' tweeks ?
Paul's keyboards ; even more funky with a new preamp ?
Mark's percussion jazzier ?

Mmmm...?

I think I just got cured of 'Lazy Itis' ; & caught the DIY upgrade bug again !
Said that last year...
...but this winter could be the last winter of discontent !

I'm sure the stalwart members of diyAudio will help make my Mondays, happy !

Thanks already to :-

Salas...
...or 'Salad' ( as he's sometimes known as, when you hit the wrong key at 2am )
For 'leafing' through cartridge data & 'needley type knowledge'.

Merlin...
...Thanks for the TT stuff you sent me a while back.
I will also be checking out your component updates.
" They are not resistors, They are CALIBRATION INSTRUMENTS ! "

Volker...
...For good chats on toobs & sending me the MA-12's constructor guide.

Vynal Kid...
...For pointing out the sinister dial settings on the Mullard 3 Watt.
( don't worry, I always play on 11 ! )

...and last, but by no means not least...

Ricardo...
...Quote :- " I keep a few pF's on crocodile-clips ; just in case "
I can tell I'm heading this way.
Hey Ricardo...Can you PM me the schematic ?

& of course everyone else who I've chatted with on diyAudio.

2012
The silver-jubilee year for...

' SQUIRREL AND G-MAN TWENTY FOUR HOUR PARTY PEOPLE PLASTIC FACE CARNT SMILE ( WHITE OUT ) '

Where's all the media tributes & re-mastered releases ? Did I miss 'em ?
Oh well...
...They weren't The Beatles...

...or were they ?!

Next up

What clunky-kit we've got...
...&...
What less clunky concepts we have cooking.

' Tart Tart ' an bye for now.

Si.
 
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Our Clunky Kit........................

Sorry about the thread title bye the way...
...Monday's fans will know, there should be 'plastic face' in it also...:(
...Oh well...nothings 'perfect'...It seems to fit on the board well though...at least on my vintage 4/3rds screen anyway ( might get a widescreen...one day...maybe ).

Last summer we had a bit of a turntable clear-out; and managed to get rid of 4 !!!! :eek:
So we only have 3 left now; and will focus on getting the least sorted one, sorted.
We also had a bit of a rumage through the 'cartridge grave-yard' to see if we could turn up any of the 'usual suspects' for a quick line-up...:grumpy::grumpy::grumpy::grumpy::grumpy:
...found a couple that could be good for setup; but will get a new something, in due course.

Anyway; this is what we're playing with at the moment. :note::note::note:
The items in upper-case, are what we have.
The items in lower case, are what we need to make or purchase.

denon dl-? :confused:

SME 3009 TONEARM

THORENS TD160 MKII

inverse riaa pre-emphasis filter :confused:

DIY... HA12017 SOLID-STATE RIAA PREAMP

DIY... BC549 / ECC88 HYBRID TRANSISTOR / VALVE RIAA PREAMP

new diy 2 stage passive eq riaa preamp :confused:

DIY... AUDIO SYNTHESIS PAS-02 138-STEP ATTENUATOR PASSIVE PREAMP

tape sources are :-

DENON DN-770R

FERROGRAPH SERIES V

SONY PRO WALKMAN

( we also have a Technics tuner ! )

:rolleyes:

So in a nut-shell; what we're looking at doing, is...

Choose a new cartridge that will suit the SME arm & Thorens TT.
Strip, clean & refurbish the SME arm.
Strip, clean, mod & refurbish the Thorens TD160 MKII.
DIY build an inverse RIAA filter.
DIY build a new 2 stage passive-eq RIAA preamp ( the 2 previous ones have feedback EQ ).
Soup-up anything else we find, that isn't souper enough already.

:p

Thought at first I'd be getting to mess about with new carts & arms & cool stuff like that straight off...
...but no; decided first, to look into DIYing the new inverse RIAA pre-emphasis filter.

What could be easier than that ! :mad:

Mmmm....?

:D
Si.
 

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Unbalanced ?...Semi-Balanced ?...or...Balanced ?...that is the question...

Well...The whole 'Inverse RIAA' thing, has turned out to be a bit of a can of worms !

Having initialy found, quite quickly, what seemed like a good solution...
...never one to buy the first answer, without further inquiry; we found another take on things, which looks to shoot the first one, right outta the water !

About a week later, finaly ( believe it or not ! ); we appear to have turned up, what seems like reasonable & solid information, from a guy who appears to know his stuff ( done his homework ! ), and seems to be putting forward his version of an inverse RIAA filter, which actualy looks 100% OK.

Making this filter to absolute NASA type space-age tolerances, we think, is going to be very important to us a bit later on, when we start making our passive RIAA networks for the new preamps.

More on 'Inverse RIAA' soon...

-----------------------------------------------

The other thing that's in our attention at the moment, is whether or not to make a 'balanced' phono preamp ?
Not sure though whether there is a 'MAJOR +' to be had from this or not ?

As a user, and builder of recording equipment, balanced working is obviously familiar ground; particularly with very low output microphones.

In DIY terms, since we will have a case & 2 power-supplies for the new preamp anyhow...
...it seems to me, balanced just needs 2 extra preamps to be made ( & 2 output transformers ).
Seeing as cases, mains-transformers & power-supplies are already required; going balanced, isn't going to even double the cost.
I figure maybe 50-30% extra cost ( economy of scale coming in here as well, with larger component orders ).

We are thinking at the moment, to use a high output MC cartridge; so won't be using step-up transformers.
Wire-wrapping cable seems quite popular as a tonearm re-wire; I am guessing most people who do this though, are using step-ups.
The other take, as a DIYer, is go 'semi-balanced'; and just re-wire the TT outputs with microphone cable and XLR's, with the screen connected only at the preamp.

At the end of the day also, I am essentialy a minimalist...
...is going 'balanced' & adding twice as much of everything worth it, in terms of performance returns ?

I have tried to consider all the angles on this one...
...I am not sure if I am being a bit 'thick' on the issue...
...but I can't seem to come to an easy conclusion.

If any members have gone 'balanced', especialy with a high output MC & no step-ups...
...or if anyone has any advice or experience which might help solve this question for me...
...I would welcome your comments.

I'm about 50-50 on this at the moment...
...which ain't gettin' me very far !!!

Cheers

:D
Si.
 

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Mr Postman Look And See...

Hi Georg

I'm sorry to say I never did either...
...Oh well...other tings woz good as well !

Yeah... That 'Inverse RIAA' is a real minefield Holmes...
...We tink we gotta take on dat ting...
...more later...
( very controversial...probably )

Keep it spinnin' Georg...
...Boo Yah !!!

-------------------------------

The postman only called once today...

(Mister Postman look and see.)
Please, Mister Postman, oh yeah.
(Is there a Russian capacitor for me?)
Please, please, Mister Postman, oh yeah.
(You know it's been a long, long time.
Since I heard from that Commissar of mine.)

So many days have passed me by.
You saw the tears in my eyes.
You wouldn't stop to make me feel better
By leavin' me a micro-Farad or a letter.

(Mister Postman look and see.)
Please, Mister Postman, oh yeah.
(Is there military music for me?)
Please, please, Mister Postman, oh yeah.
(You know it's been a long, long time.
Since I heard from that turntable of mine.)

You better wait a minute,
(Wait, wait a minute.)
Oh, you better wait a minute.
(Wait, wait a minute.)
Oh, you better wait a minute, wait a minute.
(Wait a minute.)
Oh you gotta wait, wait.
(Wait, wait.)

:p
Si.

Ex-Soviet hardware ROCKS Beavis...'Yeah...Arrhh...HHaaggg..Graaahh ...h...G...brrrr...'
 

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Some of the Polytetrafluoroethylene arrived today; for the phono-pre circuit boards.

This is the 6mm thickness we ordered.
We also ordered 3mm thickness; to suit our favorite 'turret tags'...
...should they be needed.

This material can be a bit 'floppy', in our experience.
However; have only used it in very thin sheet form & various diameter rods previously.

The very thin sheet used previously; actualy came with self-adhesive backing.
I think this was a very specialist adhesive; since my guess is, glueing anything to the surface, is pretty difficult.
Anyone got any glueing tips; or know any adhesives that work with this ?
( just thought I'd ask )

Anyhow...
...could be great for phono-pre boards...
...easy to de-flux...
...and I guess if you spill any of your scrammbled-egg breakfast on it, there will be no sticking either !

Any tips from seasoned users; most welcome !

Cheers.

:D
Si.

Now playing :-
Ryoji Ikeda - '1000 Fragments'

I think the album cover looks familiar...
...Mmmm

I wonder if it's any good for 'Back In Black' clones ?
 

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Hi sq !

Arr...a Sheffield lad !
New it well...back in the day.
Birth-place of some of the finest music on the planet !
( we think anyhow )

No they are not 'Homies'...
...They are the 'Lil' Locsters' by O.G.Abel.

I like David Gonzales's artwork quite a bit...
...but when you compare 'The Homies' to the 'Lil' Locsters' in the flesh...
...there really is no contest.

The 'Homies' have nice characters; but the sculpting & painting is VERY poor by comparison.

--------------------------

Nice little pack of IRF9610's arrived in the post today !

Slowly but surely getting some bits & bobs together for the new project.

It seems to be changing a little at present...
...we are now thinking to build, not just a phono-pre, but a fully featured preamp...
...ie. with more sockets, selector, volume & line-stage.

Same kind of circuits & ideas churning around.
Just looking for the best 'practical' solution for the project.
( some influence from previous pre-amp builds, coming in here )

More soon.

Cheers

Si.
 
Polytetrafluoroethylene ( Part II )...

' Dr. Strange-Teflon '
or
' How I Learned To Stop Worrying & Love The Drift '
------------------------------------------------------

PTFE cap-testing @ Space Egg . drift.

Oh Dear !

Those Teflon capacitors we got for our RIAA EQ...
...might just have to go into my Granny's Amstrad system !

They look like top-gun performers, for coupling capacitors ( the good news )... :p
RIAA caps ?
Forget about it !...:mad:

Just been measuring 'capacitor drift' in the Teflons & other plastic caps such as Polystyrene.
Most disapointing, I have to say...:eek:

Had thought about using Polystyrene's in an 'inverse RIAA' to...
...simply TOO MUCH 'drift' though...:(

Looks like it's 'silver-mica' all the way now; for filter-caps anyhow...:rolleyes:

Cheers.

:D
Si.

My Granny's gonna love the Amstrad up-grade !...:sax::wchair:
 

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Where's Bez ?

Hi qusp

Is that a fancy-dress 'Gecko outfit' you're wearing ?

Whilst doing a bit of Teflon research...
...I discovered that it's the only 'known' material that a Gecko can't climb up !
So don't expect to see any hanging up-side-down, off any frying-pans, any time soon.

-------------------------------------------------

You could be right qusp.
Perhaps the new millenium may have brought improvements to Tef-tech.

Somehow though, I rec it's just the property of the material.

By the way it wasn't my intention to diss the Ruskie Teflons in the slightest.
The Teflons & PIO's look like the modern world would be pushed to match the quality.
They are obviously well liked as coupling caps by the great DIY audio masses.
With loss less than Polystyrene, who could argue with that ?

All the other plastic-caps I measured, drifted just as much.
Only silver-mica didn't.
My last 2 phono-pre's were stuffed out with Polystyrene's ( no complaints ! )...
...so is this cap-drift actualy audible in yer average RIAA filter ?
Should I worry ?
I dunno...says Bez.

Perhaps I'm being too critical of the poor little plackys.
We did take a gamble on the precise values...
...and as it turned out...
...we just happened to get the 47nF's bang-on & the 15nF a bit over spec. PERFECT !

Anyway...
...just my terrible sense ( or lack of ) humour.
Granny, you can't have me Tefy's just yet OK ?

Next up for testing, some 'Tropical Fish' !
( also unable to scale Teflon )
Those top-boffins at Mullard knew a thing or two about gettin' a groovy sound kids !

Cheers.

:D
Si.

Bez & Shaun & Tropical Fish & Mullards Top-Boffins.:cool:
 

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Just Scored THESE to make a GARGANTUAN mains-filter !!!

As part of the whole 'analogue sources tune-up'...
...Have been looking a bit also at mains-filters.:confused:

We have had various stabs at these in the past...
...and used a few 'totaly rubbish' commercial offerings as well...
...EXPENSIVE and not worth toffee, in my opinion.:mad:

So...

We thought we'd make one about 100 TIMES BIGGER ( at least ) than what we have seen.;)

More on mains-filters soon...
...in the mean time...
...get a load of this lot !!!:eek:

Cheers

:D
Si.

If anyone's got any favorite circuits & schematics for mains-filters...
...please post-them.
Or any build-photos, of GARGANTUAN mains-filters.:cool:
Had a quick search...
...but can't find any good links.

Anyone got any ?:confused:
 
L.I.S.N. - ( Line Impedance Stabalization Network ) - to THIS

Been looking into various mains-filter ideas, for the new phono-preamp & TT refurb. :eek:

Found this interesting device...
...obviously quite a bit going on inside, other than just a mains-filter. :confused:

L.I.S.N. :sax:
Line Impedance Stabalization Network. :cool:

Seems to contain a mains-filter to MIL-STD 461 e & f ( military standard )...
...and perhaps other PSU bits & bobs. :rolleyes:

Aparently...a standard, high-performance, test-setup, mains-filter for EMC ( in & out ) testing of military spec. hardware. :eek:

Anyhow, thought it looked interesting so here it is ! :D

Values are :-

C1 - 8uF
C2 - 250nF
R1 - 5 Ohms
R2 - 1K Ohms
L1 - 50uH

Cheers.

:p
Si.

A Schwarzbeck NSLK 8127. ;)
 

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Listen to W I R E ! baby . . .

Holy WIRE-WOUND boy wonder !
Gotham City can't resist this...
...Dr. Ohm & his WW's ! :eek:

Jees...
...That took ALL DAY.
Been meaning to do it for a while.
The humble resistor.
Where would we be, without loads & loads of loads.:confused:
Decided to go 100% wire-wound on the new projects.:sax:
Finally got all the little critters coralled-up, ship-shape & Bristol.

Still a few parts to get...
...quite FUN this bit...:p
...seem to be heading away from 'modern' bits at the moment...
...back to the 60s' & 70s' era of E.M.I., Mullard & Lemco.:cool:
( top-notch stuff ol' chap...WHAT ! )

Power supply boards, seem to be getting speced out pretty darn modern...
...but the phono boards seem like they'll be fairly 'vintagely' populated.

Whatever next ?

Cheers

:D
Si.
 

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DIY non-inductive W.W. ultra-low-noise JFET source-resistors ( part 1 ).

Anyone who's been tuned in to Squirrel & G-Man will know...
...we're just simply wired about wire-wounds this Christmas ! :hohoho:

Yeah...Hi Santa...I'd like a stocking full of wire-wounds...please.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Anyway...
...It was brought to the attention of the R&D team @ The Space Egg Corp ( me ),
That JFET source-resistors may well be functioning quite well as 'noise generators' also.

"Do you know any good wire-wounds ?", was the question.
Well, yes, kinda.
"Are they non-inductive ?", er...um...I dunno actualy.
"Can I get them in loads of different accurate values ?", not realy, & no, only 5% tolerance usually.
"Are they really big ? Will they fit on my board ?", er...well...yes they are, & no, they probably won't.

Mmmm...
Possibly not an off the shelf, plug and play item...
...call Space Egg's R&D boffins, they might be able to lash something together.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Some time later...
...The R&D team emerged from the lab, with a prototype product.

Having promised development photos, a top level expert in miniature scientific photography, was called in to document the work.

Bud 'Rollei' is a pretty vintage-dude.
100% analogue, with his trusty 2 1/4" Sq. Rollei twin-lens; he was the obvious choice.
Bud's popped flash-bulbs with the best of 'em, back in his 'LA Confidential' type, early B+W paparazi days.
Moving on to snap all the top-drivers in the 70s' Formula 1 scene & hangin' out with George Harrison; and more recently, has specialised in 'chocolate box' photography for Cadbury's.
( the lady love's Milk Tray...yep...that was Bud )

- - - - - - - - - - - - - - - - - - - - - - - - - - - - -

We will leave Bud to supply a picture or 2, that say 1000 words...Phew !...
...+ a bit of blurb from the R&D boffins.

Here's Bud at the latest Museum Of Modern Art exhibition...
...photographing an exhibit called - 'Copper Resistor Lead-Outs'...
...by Carl Judd or Donald Andre; or something like that...
...70s' American minimalism; so I'm told, by 'her in doors'.

Cheers.

:D
Si.

Further DIY pics to follow.............................................
 

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( part 2 ) We Will Wequire WIRE !

OK...we managed to secure the MOMA exhibit Bud photographed, for our component leads.
Next up WIRE !

Morgan Jones says in his exellent book 'Valve Amplifiers' ( I keep saying that !...it really is great though; cheers Morgan )...
...basicaly says that the noise created by conventional spiral-cut metal-film resistors; is caused by " tatty edges", left by the blade or laser, that cuts the spiral.
He also says that this can vary greatly, depending on depth of cut, sharpness of blade, quality of substrate etc. etc. etc.

This was quite interesting, because he doesn't mention the metal-film itself, as being inherently noisey.

Having recently 'busted open' a large-sample of various resistors, to see what was inside; we discovered the only non-spiral-cut metal-film resistor we had.
These were originaly from a Sony pro-audio tape-machine from the 60s', and are totally exellent resistors, as far as noise is concerned.
In fact, before 'busting open' a sample to have a look, we were totaly convinced ( wrongly ) that they were wire-wounds.
Hand-made wire end-terminations & glazing; but on inspecting, a THICK-FILM construction on ceramic, with NO spiral-cut or 'tatty edges'.
This machine was 'whisper quiet', uncanily so in fact; and it was a shame to scrap it for parts, but there were so many hardened specialised rubber parts in it, the unit was mechanicaly unuseable.
The pre-amp sections though...WOW !
The sound came out of 'nowhere' & this was valve gear BTW as well...n i c e !

Anyway...
...we needed some resistance wire...
...and found a few sources to check out.

See Bud's pics.
 

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Just one more thing about the Sony pro-audio tape machine...
...and we'll get on with the DIY source-resistors story...OK ?

It DID have wire-wounds in it AS WELL AS the hand-made thick-films...
...these WERE used in typical valve-load positions ( as I recall )...
...might get Indiana Jones to 'dig it out' the back of the garage, for another shufty !

Next...
...a few points about the WIRE we found...
...and on to the R&D Depts. construction photos...
. . . n i c e !
 
( part 3 ) The Wire Is Wedy To Wound.

1.
The first wire we found was from a disassembled 70s' instrumentation pot.
n i c e !
It WAS a 200r pot ( until we bust it ! )...
...it's now partialy 'un-wound', & tested by the Space Egg R&D Dept.
TOTALY USELESS !...for the very low-value first-stage source-resistors...
...far too short a length, for the required resistance ( not easy to accurately trim ).
However...
...PERFECT ! for the 43r resistors needed for the second-stage sources...
BINGO !

2.
That's a BIG muther !
Could make a good source-resistor ( maybe ? )...
...trouble is, it won't fit on the board, next to the K170's ( shame )...
...Bud didn't get a shot of the other 'biggies' we turned-up...
...but they were from a 'skip-dive' a few years back; outside the local cell-phone tower...WOOeee !...free parts !
These are metal resistance-STRIP, wide-wound on a ceramic-core, un-potted.
I think, from some kind of 3-phase filter ( we have 3 of them ! ).
TOTALLY USELESS ! for K170 source-resistors...
...but COULD be good for knocking up some 0.33r's for a typical power-amp ( they're stashed baby ! ).

3.
Hit the mother-lode at last !
A nice roll of 60s' scientific-wire from my Dad ( R.I.P ) 's workshop.
EXTREMELY shinny, NO 'tatty edges', PERFECT length & resistance to create the low-value wire-wounds with.

BOO JAH !

It's quite difficult for Bud to take R&D photos, whilst we are soldering...
...so in true 'Blue Peter' fashion...

" Here's one I made earlier "

A Space Egg engineer QC's the connections on the prototype resistor.
( in the background; a nice 1K WW from the Sony tape-machine )

:D
Si.
 

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( part 4 ) " Would you like your Tropical Fish grilled Sir ? "

" Yes please...and served with a sprinkling of Teflon "...:rolleyes:

OK !...
...So far, so good. :p

Insulation.
In the 'Blue Peter' styleee, one we made earlier...
...we could have insulated the lead-outs & resistance-wire...
...with some 'sticky-back-plastic' or some of Val's old tights...
...but we ( fortunatly ) didn't.

Could just go 'nude' on this of course ( as is the current 'audiophile-vouge' )...:eek:
...the resistor could just be 'a loop of wire', sticking-up on the board...
...or sleeved, and just heading back to the PSU-, where it's going anyhow.

However...
...The Space Egg R&D Dept. were given the spec. to make a 0.6" pitch, user-friendly component !
So we need 'audiophile-grade' insulation and some encapsulation & professional labeling as well.
( looks better for 'the pack shot' also...
...the marketing-boys :cool: are gonna luv it ! )

The lead-outs are insulated with Teflon-tubing...
...and the resistive-element, with Teflon-tape.

BOO JAH !
Simples.

Those funky Professors @ Mullard, came up with some pretty jazzy packaging for their parts, back in the swingin' sixties...:sax:
...so what better inspiration for our enigmatic-ensapsulation, than the ' Tropical Fish ' !

:D
Si.

Bud 'Rollei' kindly provided these pics !

1. Styrene-substrate in Rotring isometric ellipse shape.
2. Mullard Tropical Fish, from the swingin' 60s'.
( anyone care to speculate on the component value ? ) :confused:
3. Substrate close-up.
( transistor to illustrate size only & is NOT included in your purchase )
 

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