Maybe something like this?:
http://ca.mouser.com/Search/Product...Cvirtualkey68800000virtualkey688-RK27112A00CC
Cheers,
Dennis
thanks Zen Mod for this simplest preamplifier.
ELMA switch, AVC (Tribute?), buffer and autoformer (using EDCOR one).
Is Jensen better choice? Needs shielding?
I´ll power with two gel batteries (simplest gauge something LM and power switch for Meanwell chip external charger).
JP
ELMA switch, AVC (Tribute?), buffer and autoformer (using EDCOR one).
Is Jensen better choice? Needs shielding?
I´ll power with two gel batteries (simplest gauge something LM and power switch for Meanwell chip external charger).
JP
Attachments
why AVC then buffer then autoformer ?
as I wrote numerous times , goal with Iron Pumpkin(s) is to simplify things maximally
selector, buffer , AVC (connected to have gain, if needed)
difference between Tribute and Jensen - can't tell from experience
I'm having my own , anyway
as I wrote numerous times , goal with Iron Pumpkin(s) is to simplify things maximally
selector, buffer , AVC (connected to have gain, if needed)
difference between Tribute and Jensen - can't tell from experience
I'm having my own , anyway
Selector --> Potentiometer --> Buffer --> Autoformer? (as showned on your blog).
or
simply: Selector --> Buffer --> AVC.
Right?
JP
or
simply: Selector --> Buffer --> AVC.
Right?
JP
first one = Iron Pre
second one = Iron Pumpkin
re-read the thread , everything written more than once 🙂
second one = Iron Pumpkin
re-read the thread , everything written more than once 🙂
Done!
But a lot of questions remaining...
What is the value for the potentiometer/attenuator for the Iron Pre?
JP
But a lot of questions remaining...
What is the value for the potentiometer/attenuator for the Iron Pre?
JP
pot - matter of sources (cojones) , but 25K is practical maximum
shielding - no need if mains xformer is far enough or outboard
shielding - no need if mains xformer is far enough or outboard
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.
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.
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
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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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.
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.
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
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