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Old 3rd August 2012, 11:32 AM   #521
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Default James Transformer

Confirmed with James today, what we need is JS-252N with 2 separate secondaries.
JS-251N has a true center tap secondary, not separate windings.

Apparently they are a tad more expensive than the Jensen mentioned here, but they have a Nickel core which is supposedly much better in the low end and lower distortion (if I understood correctly).

Last edited by Lazybutt; 3rd August 2012 at 11:36 AM.
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Old 3rd August 2012, 11:36 AM   #522
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Jensen's are 50% nickel core, I believe.
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Old 3rd August 2012, 11:52 AM   #523
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Any reason why smaller transformers (like this one) could not be used ?
Seems to me the current going through it will be relatively small (although I admitedly have no reference of what's large and small for a core to saturate...)

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Old 3rd August 2012, 11:55 AM   #524
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ZM is formely CHoky!
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Old 3rd August 2012, 01:12 PM   #525
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There is ussually a spec for level/THD @ 50Hz. That is what will tell you if you can get the input/output levels you need.
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Old 3rd August 2012, 03:42 PM   #526
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Quote:
Originally Posted by Lazybutt View Post
Any reason why smaller transformers (like this one) could not be used ?
......
there is no reason against using those

in fact , if I can see well - Jensen's aren't bigger than these

to repeat my self - if you already have adequate xformers - try them

if not , have faith in Papa's choice - buy Jensens

later - if you want - pay preputium money for Wester Electric repeaters , I will not object to that

(but I'll waste my a$$ laughing )
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Old 3rd August 2012, 04:25 PM   #527
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Isn't it interesting that in his quest for good sound Papa is going towards triodes, transformers, and simplicity, and not the uber-complex, multi-stage monstrosities that we see in most other amps?

It shows that focusing on vanishing levels of distortion is just not that important for listener preference.
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Old 3rd August 2012, 04:41 PM   #528
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if you take a good look at entire PL product line , you'll find same approach from start

what looks complicated , it isn't actually - plenty of surrounding circuitry and just few active parts
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Old 3rd August 2012, 04:54 PM   #529
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Quote:
Originally Posted by ra7 View Post
Isn't it interesting that in his quest for good sound Papa is going towards triodes, transformers, and simplicity, and not the uber-complex, multi-stage monstrosities that we see in most other amps?
It shows that focusing on vanishing levels of distortion is just not that important for listener preference.
Well, these aren't triodes, I'm not sure about going towards. He ussually makes a point of saying he is not emulating a Tube amp. He has already done the M2 and now this amp but there are different distortion characteristics for transformers, and he just now is experimenting in public with such designs. It's just that everyone thinks they are only worth while in a tube circuit and that BottleHeads are the only ones who can use them? Actually, Xfrm'rs are better than they ever have been. Maybe those xfrm'r/tube people are catching up rather than Pass doing old stuff?
Pass has been tweaking simple amps for 20+ years.
Interesting, hell yea, but not new. You must have spent to much time in the Solid State forum?
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Old 3rd August 2012, 05:01 PM   #530
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What is the sound of one transistor clapping?
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