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Old 17th July 2011, 03:17 PM   #1471
Stee is offline Stee  Italy
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Default "Son of Zeus"

a demigod
typical of Greek mythology
the theory of ancient astronauts shows
I am currently experimenting with feedback on the speaker
to equalize current with a shunt
I have not started the experiments with Zeus
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Old 20th August 2011, 09:04 AM   #1472
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Default Input transformer 8160

Can anyone explain how the input transformer Sowter 8160 with 31mH @ 1KHz 141mH @ 120Hz can give 20Hz -3dB. As alternative a 10VA toroidal transformer can extend well to 20Hz but with inductance around 500mH. Do I miss anything?
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Old 20th August 2011, 10:59 AM   #1473
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Please disregard my previous post. Found a problem.
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Old 11th September 2011, 10:34 PM   #1474
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Default eBay transformer core kit3

For winding your own output transformer, has anyone tried one of these?
Push pull single end Audio output transformer core kit3

..and if so, can you comment on sound quality?

Can someone knowledgable on transformers comment please on suitability of this double C core material for a Zeus?

I've read this entire thread and I know that Susan had intended to try and report on C cores. However, I don't recall ever seeing a report.

Thanks
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Old 27th September 2011, 09:46 PM   #1475
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Default time travel

Thank you all for this thread. It`s like a time-travel for me. This topology (with Ge BJT`s of course) was my first solid-state amplifier. Later I used Si transistors (2N3055, what else?), added sliding bias (I reinvented Malcolm Hill`s heat generator) and learned a lot about transformers.
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Old 19th October 2011, 04:22 PM   #1476
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Quote:
Originally Posted by franzm View Post
Thank you all for this thread. It`s like a time-travel for me. This topology (with Ge BJT`s of course) was my first solid-state amplifier. Later I used Si transistors (2N3055, what else?), added sliding bias (I reinvented Malcolm Hill`s heat generator) and learned a lot about transformers.
If you want to make a second time-travel, check out this threads:
Overview of Brands and Models from first Solid State Audio Amplifier Components want.
and
Vintage Transistors
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Old 3rd November 2011, 03:09 AM   #1477
kevinh is offline kevinh  United States
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Quote:
Originally Posted by charliemb View Post
For winding your own output transformer, has anyone tried one of these?
Push pull single end Audio output transformer core kit3

..and if so, can you comment on sound quality?

Can someone knowledgable on transformers comment please on suitability of this double C core material for a Zeus?

I've read this entire thread and I know that Susan had intended to try and report on C cores. However, I don't recall ever seeing a report.

Thanks

I think she has been pretty busy lately and hasn't finished testing yet, you might see her website bout building your own if you are especially ambitious.
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Old 3rd December 2011, 08:31 AM   #1478
Stee is offline Stee  Italy
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Default toroidal output as VAS stage

I found a way to equalize the response of the speaker
using the power consumption (shunt resistor)
and eliminating the need for cross-over
so speaker (16-18cm max) is not filtered

also uses a toroidal power
as a voltage amplifier
because transistors have hFE flexing
with increasing voltage
so are suitable to amplify only the current

Note that the sum of the balanced input signals
is done with a transformer signal
and constitutes an important contribution to the realism of the scene
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Old 5th February 2012, 04:54 PM   #1479
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Default Double C core output transformer for Zeus

Hi Charlie,

Quote:
Originally Posted by charliemb View Post
For winding your own output transformer, has anyone tried one of these?
Push pull single end Audio output transformer core kit3

..and if so, can you comment on sound quality?

Can someone knowledgeable on transformers comment please on suitability of this double C core material for a Zeus?

I've read this entire thread and I know that Susan had intended to try and report on C cores. However, I don't recall ever seeing a report.

Thanks
[I hope to be able to get something made and start testing some C-cores over the next month or two. Note however that I will be using amorphous c-cores so it will not be quite identical.]

For a full bandwidth Zeus one would use the Kit 4:

Tube Audio output transformer Double Cut Core kit 4 | eBay

The seller says "Itís a special order of this Japanese silicon steel core material that design not for 60Hz but 400Hz (Equal or better then M6) together with the stunning ultra thin 0.23mm lamination thickness. Itís the best in class silicon steel core type material you can get for audio transformer building.".

Note that the material is silicon steel and compared to M6 material. This is still good as the thinner lamination thickness should reduce Eddie current flux.

Whether this is audible, I can't say as so much depends on other factors.

If your music source is only CD then I suspect the improvement would be minimal. If you have a full analogue system with vinyl then I think there is a good chance for that to be audible.

BUT it depends on so many factors that it is difficult to be definitive without full end to end control (which is why I designed my own phono cartridge and build my own speakers as well as the bits in the middle).

However compared to the price of buying ready made transformers then with a bit of patience one has the possibility of making something that is cost competitive and should be at least as good as a M6 EI core part. Don't forget that the magnet wire is also a fair cost these days.

Hope this helps.

Best wishes,
Susan.
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Old 5th February 2012, 09:52 PM   #1480
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Default Power Transformer Cores?

Decades ago, I have used power transformer cores for audio, not super hi-fi, in PA amps, car stereo power amps, and other general purpose audio power amps, with fairly good results. I'd be interested in some discussion regarding performance limitations expected by use of power transformer iron in audio use. Thanks.
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