Iron Pumpkin(s) and other smaller vegetable animals

[Zen Mod]

why - as I said - you already have AVC and few Toshiba JFets........ and schematics are above , of which you can use reg part , while making complementary JFet buffer

some veroboard , and money best invested in some LPs

 

[Zen Mod]

more pics

 

[tubesguy]

more pics

"Zen Amount"

 

[Zen Mod]

next time "Input" will be replaced with "Zen Source"

 

[kbergsson]

why - as I said - you already have AVC and few Toshiba JFets........ and schematics are above , of which you can use reg part , while making complementary JFet buffer

some veroboard , and money best invested in some LPs

True, but I like your execution with input selector and volume selection relays and for that matter I already have a nice Aikido linestage

 

[noelectrix]

ZM, sorry for asking the 3rd time, whats the height of SE Turtle? can remember 8cm (2HE case), but also 9,5cm...?? Did not find information in thread or my papers.
Just to ensure that Iron Pre does properly integrate in coffee machine : )

all best
stefan

 

[noelectrix]

xformer prescribed - 30Vct to 36Vct , minimum 150mA , one per channel , to preserve dual mono arrangement

or - if you're able to get custom one , use one with two sets of 30Vct (to 36Vct) secondaries , 300mA minimum

15 mA per channel? 150 is quite a donut : ), in your picture i´d assume a 8cm x 4 cm Trafo.

best
st

EDIT: arrr not 150 VA : )

 

[Zen Mod]

I'll tell you anything about dimensions , in few days

now I can't be sure , while out of workshop

 

[Cappy]

I just got mine a few days ago. Mine measures 89mm (3.5 in) including the screw heads on both sides holding the plastic top and bottom pieces together.

This AVC is definitely the best looking volume control in the history of mankind. It would be a pity to hide it in your espresso maker.

 

[noelectrix]

@cappy.tnx for info (and have fun with yr build)

best
st.

 

[Zen Mod]

........

This AVC is definitely the best looking volume control in the history of mankind. ......

thank you for your kind words

I really really really invested all my heart in that (I hate word -> ) project

 

[shattered_dream]

In the hopefully not too distant future I will buy one...

 

[Extreme_Boky]

thank you for your kind words

I really really really invested all my heart in that (I hate word -> ) project

And it shows! Exceptional pre-amp/tone control; the only way they ought to be made if nothing but the best sound will do Well done, congratulations, bravo majstore.

 

[marconi118]

what is the main advantage of using 2SK2145 instead of J111 j112 j113 ?

 

[Zen Mod]

they're simply better parts , for audio purposes

while 2SK2145 are made for "Audio Frequency Low Noise Amplifier Applications" , J111 etc. are "chopper" parts

see datasheet : https://www.google.com/url?sa=t&rct...Name=2SK2145&usg=AOvVaw3-QiMZoACjq-xrd1YMVMdk

 

[marconi118]

how do you match the 2 jfets inside one chip?

Are there many differences or the 2 jfet on the same chip are almost matched every time?

 

[Zen Mod]

1. they have common source , so certainly being matched good enough
2. I'm treating one tiny bugger as one JFet ....... so just taking care of triplets matching

 

[noelectrix]

@ZM, do you have a dealer for the 2x30Vct Trafo? Space is little in my case, but i didn´t found dealer for 2x30vct. Two of the donuts woud be too big, and i´d go for one 30Vct otherwise and leave the separation to the shunts : )

best
st

 

[Zen Mod]

what you mean by - do you have a dealer ?

you mean , my local one ?

I have , several ,pretty much always ordering custom (regular production being in industrial range of values) ...... though , I can't tell are they willing to send out of country

send me an email in few days , I'll check in a meantime what can be done

in any case , shunts will do what's expected with rails , but once you connect GNDs of two channels , there is a headache on the horizon

so , leave them separated , on any price ....

 

[noelectrix]

local one.. sounds romantic : ), i definitely send yo a mail, maybe there´s possibility to upgrade package : )

pics of hillclimbing?

best,
st