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Old 24th June 2012, 11:39 PM   #3391
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The Sowter mic input transformers for sale in swap meet would be a good inexpensive try at the concept. Sowter is a quality brand $30 can tb ebeat anywhere. If you like it, then you get to have fun trying different ones to find the perfect one. Ill be trying the sowter as soon as i get them.
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Old 25th June 2012, 06:16 PM   #3392
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Quote:
Originally Posted by flocchini View Post
Choky as you said

"- it's worth trying xformer as in M1 - nested between input buffer and output stage

- it's worth trying xformer connected as autoformer ; if you need drawing of that ,just say ."

With your schematic as reference would it be possible to connect transformer between junction of R4/R3 and junction of C1/C2.

I would use Jack Ellianos PVA2-N as generg favored it in post 23 of MAGMA thread - Introducing the MAGMA front end for BA-2 and F4

I believe it could also be wired as an autoformer. Cost is nice as 4 of these would be less than the Lundahls

Cost of the Sowters buzzforb recommends if appropriate are even better. Haven't heard back from seller.


Thanks

Bob
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Old 25th June 2012, 06:26 PM   #3393
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He is out of town for the week. Patience comes to those who wait.
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Old 25th June 2012, 06:36 PM   #3394
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Quote:
Originally Posted by flocchini View Post
Choky as you said

"- it's worth trying xformer as in M1 - nested between input buffer and output stage

- it's worth trying xformer connected as autoformer ; if you need drawing of that ,just say ."

With your schematic as reference would it be possible to connect transformer between junction of R4/R3 and junction of C1/C2.

I would use Jack Ellianos PVA2-N as generg favored it in post 23 of MAGMA thread - Introducing the MAGMA front end for BA-2 and F4

I believe it could also be wired as an autoformer. Cost is nice as 4 of these would be less than the Lundahls

Thanks

Bob


for your balanced F4 can iteration , you need xformer with center tapped secondary , or in other words - with two section secondary

either that , or using one xformer per leg ...... which isn't smartest thing if you can choose

I don't know does PVA2-N have CT secondary
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Old 25th June 2012, 08:43 PM   #3395
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either that , or using one xformer per leg ...... which isn't smartest thing if you can choose

Choky

Is this not wise because of the variation of one transformer to the other?

Thanks

Bob
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Old 25th June 2012, 08:57 PM   #3396
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I'm living in believe that two phase balancing act is much more intimate , if happening in one magnetic circuit

one thing is , say , if you have normal M2 and you want to bridge it

another thing is if you're going to make balanced M2 from scratch
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Old 25th June 2012, 09:11 PM   #3397
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Try a Jensen JT-123-ALCF as a 1:4 autoformer.

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Old 25th June 2012, 10:17 PM   #3398
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buzzforb - thanks for info

Choky - I understand your belief that best sound comes from one magnetic circuit

Nelson - thanks for recommendation - a couple of questions if you don't mind - remember it takes time for this to sink in my brain

Are you recommending one of the Jensens in each of my R-, R+, L+, L- legs?

Can they be connected at junction of R3/R4 (input) and junction of C1/C2 (output) on the F4 board?

I think wiring as a autoformer is grounding brown lead, connecting red and orange and using that as input, connecting yellow/ green, connecting blue/violet and using grey as output (ref http://www.jensen-transformers.com/d...s/123alcf3.pdf)

Thanks again to all and for anyone looking for a headphone amp - a balanced F4 is at the top of my list
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Old 25th June 2012, 11:01 PM   #3399
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two things , unfortunately :

1. I'm not Pa

2. yes , with Jensen , being xformer sans CT secondary , you must use one per leg

3. looking at schm you posted in #3390 , connection is like attached :

4. #3 and #4 are just to confuse you , considering two things mentioned
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Last edited by Zen Mod; 25th June 2012 at 11:17 PM. Reason: edited drek gif
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Old 25th June 2012, 11:06 PM   #3400
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By that drawing, autoformer would be

BRN to GRY

VIO to BLU

GRN to YEL

RED = GROUND

ORG = OUT

BRN = IN

Correct me if I'm mistaken, ZM

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