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Old 27th July 2012, 02:07 PM   #361
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Quote:
Originally Posted by Zen Mod View Post
generally very good idea ,but you must consider that those Jensens aren't expensive

regarding repeater coils - each type demands testing

these which I pictured are flat 20-20 [Impressive]
You fly the Serbian flag [from an earlier post]; but your mastery of the English language is downright excellent!

Please note than a DIYer of any discipline is inquisitive, craves experimentation and will seeks to implement own reproduction of any design. This DIYer will generally go where the weather suits its clothes. The bolded lyric was from the 60's or 70's by Nielsen. The complete lyric is "I am going where the sun keeps shining and the weather suits my clothes" Location and weather may have been CA.
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Old 27th July 2012, 02:17 PM   #362
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In general, I am not in favor of gutting test equipment for the innards -- except that I do it all the time with HP465's amplifiers, one 403 a.c. voltmeter which sports new rechargeable cells and one 3400 etc. Hewlett Packard made a telecom test kit with oscillator, voltmeter and patch panel -- you find beat up ones at ham fests -- and the 353 has the following transformer:
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Old 27th July 2012, 02:32 PM   #363
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by Antoinel View Post
..... Location and weather may have been CA.
regarding that .... I'm rooting all these years that Papa adopts me (I would be lost in his Arc in first day , anyway ) ....... but he very cleverly avoids that all the time

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Old 27th July 2012, 02:51 PM   #364
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Quote:
Originally Posted by Zen Mod View Post
you can beat that only with something like this (there are also 600ct:600ct types , looking exactly the same -all of them having toroid nickel core ) :

Click the image to open in full size.


see more here : PAPA'S KOAN ....... was Papa's Surprise


same jobbies made by Tamura and WE are having price equaling their weight in gold

and they are plain and simple repeater coils , as called in Telephone Service duty

so - here is another tip - look for old repeater coils , and stash them in quantity .....


Choky
You weren't kidding about repeaters and gold - Jensens are a steal

2 X VINTAGE 1967 WESTERN ELECTRIC 111C REPEATING COIL / REP | eBay

I know I am quite happy about the Jensens in my F4 headphone setup
Best

Bob
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Old 27th July 2012, 03:08 PM   #365
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Originally Posted by flocchini View Post
Choky
You weren't kidding about repeaters and gold - Jensens are a steal

2 X VINTAGE 1967 WESTERN ELECTRIC 111C REPEATING COIL / REP | eBay

I know I am quite happy about the Jensens in my F4 headphone setup
Best

Bob
~$ 400 for WE coil on ebay!
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Old 27th July 2012, 03:10 PM   #366
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Originally Posted by Zen Mod View Post
regarding that .... I'm rooting all these years that Papa adopts me (I would be lost in his Arc in first day , anyway ) ....... but he very cleverly avoids that all the time

Lucky you. Mr. Pass may have a personal museum of all of his creations in chrono order till 2050.
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Old 27th July 2012, 03:12 PM   #367
lhquam is offline lhquam  United States
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Does anyone have an idea what THD levels are achievable with the circuit?
With only the output FETS for gain devices, there is very little open-loop gain left over for negative feedback. Thus, linearity of the output FETs is crucial.

In my 1 watt into 8 ohms SPICE simulations, biased at 1.3A, I am seeing very low 2nd harmonic, but 4th-11th harmonics that are roughly as large as the 3rd. I do not know if this is a simulation artefact, or due to a deficiency in the circuit.
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Old 27th July 2012, 03:29 PM   #368
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little patience can't harm

we'll be given with measured performance data , judging by previous experience



btw. Spice is here pretty much useless , just because Spice doesn't know drek about exact xformer
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Old 27th July 2012, 03:29 PM   #369
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Cinemag is another alternative ,good and nice price , to 80% nickel.....

Audio Splitter Transformers

custom:
Onetics
Slage

Eu
lundhall
sowter
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Last edited by nicoch58; 27th July 2012 at 03:33 PM.
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Old 27th July 2012, 03:36 PM   #370
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my experience with iron is - if you already have some , try it for anything you need ;

if you don't have them already - buy confirmed/prescribed ........ especially if they're cheap , as in this case .

can you imagine effort invested in testing 15 different types , for after DAC I/V duty ?

just to realize later that good old Beyerdynamic mic 1:7 (or 1:10) are best and pretty much easy available

catch was that I had those 15 different types in box .....
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