I am sorry for noob questions.
That transformer is only 275usd(finemet core) for pair and 220usd(amorphous core) pair.
So wondering if I could use for cheaper.
But it's not autoformer but transformer so do I need to use it on potentiometer and also need cinemags?
That transformer is only 275usd(finemet core) for pair and 220usd(amorphous core) pair.
So wondering if I could use for cheaper.
But it's not autoformer but transformer so do I need to use it on potentiometer and also need cinemags?
personally, I prefer AVC to TVC from various reasons, main is that I still need to stumble on TVC which is sounding better than AVC, made on same quality core
however, that doesn't need to prevent you of trying it, if you wish
in general, if you want to use AVC or TVC with Iron Pre, changes are trivial
if I explain the concept you'll easily understand
when you have stage equipped with regular resistive attenuator ( whichever sort of resistive attenuator is there - common rotary type, sliding type, discrete switch, Muse-like chip), arrangement is :selector-attenuator-buffer , and in case of Iron Pre - added autoformer on output, to have some gain
with stages equipped with inductive attenuator ( be it AVC or TVC), arrangement is as : selector - buffer - AVC (TVC)
all that covered in details in https://www.diyaudio.com/community/...s-and-other-smaller-vegetable-animals.311852/
if you want to use Iron Pre with inductive attenuator, all you need is to short pads on pcb intended for regular resistive attenuator, and to wire chosen AVC (TVC) instead of original autoformer (Cinemag, Edcor, Jensen)
now, if you put link to that TVC, I can tell you little more what I think; some TVCs are even possible to use as AVC, simply leaving secondary not connected
though, I believe t would be better buying AVC instead of TVC, when there is no need for galvanic isolation ............ which is - in my book, sole reason to choose TVC instead of AVC
however, that doesn't need to prevent you of trying it, if you wish
in general, if you want to use AVC or TVC with Iron Pre, changes are trivial
if I explain the concept you'll easily understand
when you have stage equipped with regular resistive attenuator ( whichever sort of resistive attenuator is there - common rotary type, sliding type, discrete switch, Muse-like chip), arrangement is :selector-attenuator-buffer , and in case of Iron Pre - added autoformer on output, to have some gain
with stages equipped with inductive attenuator ( be it AVC or TVC), arrangement is as : selector - buffer - AVC (TVC)
all that covered in details in https://www.diyaudio.com/community/...s-and-other-smaller-vegetable-animals.311852/
if you want to use Iron Pre with inductive attenuator, all you need is to short pads on pcb intended for regular resistive attenuator, and to wire chosen AVC (TVC) instead of original autoformer (Cinemag, Edcor, Jensen)
now, if you put link to that TVC, I can tell you little more what I think; some TVCs are even possible to use as AVC, simply leaving secondary not connected
though, I believe t would be better buying AVC instead of TVC, when there is no need for galvanic isolation ............ which is - in my book, sole reason to choose TVC instead of AVC
that meant to be primary
secondary is what's tapped and we can use it solo, without primary
Thank you for explain.
Now i understood to need to start saving for iron pumpkin.
Probably after iron pre.
Now i understood to need to start saving for iron pumpkin.
Probably after iron pre.
Baobei,
Did you ever get your Iron Pre working with the Muses? If so, happy with how it worked out? I'm considering using the same attenuator with mine.
Evening everyone, may i ask a question about transformers for se version only.
I have access to some 600:600 transformers with no indication which windings are primary or secondary or of the phasing. With power transformers I connect a 12 volt power pack to the windings and work out the polarity. Can I do the same for auto transformer connection?
Or should I just connect the output of the buffer until I get an arrangement that works?
Thanks, sp
I have access to some 600:600 transformers with no indication which windings are primary or secondary or of the phasing. With power transformers I connect a 12 volt power pack to the windings and work out the polarity. Can I do the same for auto transformer connection?
Or should I just connect the output of the buffer until I get an arrangement that works?
Thanks, sp
ZM, I have a diy Django TVC pre I'm considering using as part of my future iron pre build. Any experience with the combo? You've mentioned that using a buffer with atc/tvc is one step back, two forward, can you explain that a little more?
http://shop.diyhifisupply.com/product/tvc-transformer-volume-control-pair-supermalloy/
http://shop.diyhifisupply.com/product/tvc-transformer-volume-control-pair-supermalloy/
easy peasy
have you possibility to measure inductance and Rdc of full secondary (S1 to S23)?
edit: never had or heard Django, but I'm presuming it's good enough
have you possibility to measure inductance and Rdc of full secondary (S1 to S23)?
edit: never had or heard Django, but I'm presuming it's good enough
Hi Zen Mod,
Out of curiosity could you please tell me why did you ask this question?
because I strongly believe that small signal ( so no current to speak of) must go through tiniest possible wire
that's just one of my Fetishes, though I'm not militant (much) that other must follow me
that's just one of my Fetishes, though I'm not militant (much) that other must follow me
I see, thanks.
In that specific case, how much it would be "tiniest possible" in the real world?
I mean, how thin do you really use in your preamp?
That's what is the criterion of choice?
Just as an example, is the difficulty or ease of welding also a factor of choice for achieve "tiniest possible" goal?
In that specific case, how much it would be "tiniest possible" in the real world?
I mean, how thin do you really use in your preamp?
That's what is the criterion of choice?
Just as an example, is the difficulty or ease of welding also a factor of choice for achieve "tiniest possible" goal?
see, when I'm making it and I know it'll not leave my workshop or house, I'm trying to use 0.1mm Dia for input signal wiring; solid copper silver plated
for everything else, I use 0.22mm Dia solid copper silver plated
have some NOS spools of wire which I simply can't remember name of, but nowadays you just search for Kynar at usual places
for everything else, I use 0.22mm Dia solid copper silver plated
have some NOS spools of wire which I simply can't remember name of, but nowadays you just search for Kynar at usual places
Laziest approach for signal cable that has worked for me is to use already twisted solid copper pairs from network cable. I have a spool of CAT3 solid 24AWG cable that has all the small signal twisted pairs I'll ever need. Not as fancy as ZM's special stash, but smaller gauges are probably easily available with searching.
Hi Zen Mod, unfortunately I have no pictures because the transformers are hundreds of kilometres from me and in an area affected by floods.
I guess I should have made a more general request.
Thanks, sp
in general, with repeater coils (old name for 600:600 jobbies) it's irrelevant which one you use as secondary and which one as primary
further - if you see one side having more Rdc, that's secondary
if all windings are having same Rdc, irrelevant