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What's wrong with the kiss,boy ?
What's wrong with the kiss,boy ?
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Old 15th July 2017, 09:56 AM   #431
Zen Mod is offline Zen Mod  Serbia
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What's wrong with the kiss,boy ?
pot - matter of sources (cojones) , but 25K is practical maximum

shielding - no need if mains xformer is far enough or outboard
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Old 16th July 2017, 03:38 PM   #432
JPS64 is offline JPS64  Germany
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Iron-Pre with batteries.

Missing potentiometer/attenuator.

JP
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Old 17th August 2017, 08:50 PM   #433
Zen Mod is offline Zen Mod  Serbia
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What's wrong with the kiss,boy ?
it seems I'm going to open new thread pretty soon .......
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Old 17th August 2017, 09:33 PM   #434
Dennis Hui is offline Dennis Hui  Canada
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What's wrong with the kiss,boy ?
Woohoo!
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Old 17th August 2017, 09:41 PM   #435
Soundhappy is offline Soundhappy  France
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Quote:
Originally Posted by Zen Mod View Post
it seems I'm going to open new thread pretty soon .......
Bravo ZM !

Click the image to open in full size.
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Old 17th August 2017, 09:44 PM   #436
2 picoDumbs is offline 2 picoDumbs  Australia
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You've been hard at work
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Old 17th August 2017, 11:14 PM   #437
MASantos is offline MASantos  Portugal
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Cool!!!

ZM, I am thinking of an IronPre/M2 integrated amp, any disadvantages here of having many transformers in the same case? Might they have interference between them? I don't know much about signal transformers.
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Old 17th August 2017, 11:28 PM   #438
Zen Mod is offline Zen Mod  Serbia
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What's wrong with the kiss,boy ?
if you want that , you can skip input JFet buffer in M2 , driving M2's autoxformer directly from AVC

hypothetically ......... 2 possibilities

1. Iron Pumpkin ( buffer +AVC ) - M2 buffer omitted - M2 autoxformer
2. M2 buffer - AVC - M2 autoxformer

no harm done cascading two xformers , simply because AVC with preceding buffer is pretty low output impedance device

of course that , in case of No.1 you could have full preamp convenience , Iron Pumpkin is having shunt reg , buffer and selector on board

new , dedicated thread with full technical info - pending .... in few day's time

no interference between signal xformers ........ only thing you need to take care of is putting signal ones on one side of case and mains xformer in other side - just like in original M2
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Last edited by Zen Mod; 17th August 2017 at 11:35 PM.
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Old 18th August 2017, 12:23 AM   #439
MASantos is offline MASantos  Portugal
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But does it make any sense to mate those two together? too much "transformer" sound?

Could it be better mated with a BA3 for instance? I'll wait for the new thread and for the first build to get a better understanding of the various options.
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Old 18th August 2017, 05:36 AM   #440
Zen Mod is offline Zen Mod  Serbia
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What's wrong with the kiss,boy ?
generally speaking - if you observe preamp and amp as black boxes , and you find them adequate for task - who cares what's inside them ?

Iron Pumpkin is (hardly novel idea) my last iteration of obtaining line stage with (settable) moderate gain and volume control in one element , with more than decent output impedance

that - speaking of both SE and balanced variant

speaking of balanced only - you get any possible combination of SE-bal and bal-SE conversion , in truly differential manner

all that - not because I'm any clever ...... simply because xformers are really great devices , when used properly

.......and M2 is ......... M2

best Papamp ever
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