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Using mains transformer as output transformer
Using mains transformer as output transformer
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Old 10th October 2008, 07:07 PM   #171
boiss is offline boiss  Italy
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Hi Revintage,
Some food for thought, really not too worried about the driver as it will be constantly running grid current. Driver could even be SS transformer coupled. I want 2 big bottles up there, fantastic visual impact and with 150 watts of filament power at least 10W of impeccable sound.
A bit miffed that it cant be done with 100V HT. Anyone understand why 833 characteristics look like a classic pentode?
Seriously, triode chars are all vertical while these are all horizontal.
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Old 10th October 2008, 07:13 PM   #172
boiss is offline boiss  Italy
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Maybe I should add that I use 813s where others use a DL96, ie even lower HT like 25V for RF etc.

How about a simple desktop regen MW RX (tuner) using an 833 with all of it running on 10V dc inc the filament supply.
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Old 10th October 2008, 07:24 PM   #173
boiss is offline boiss  Italy
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Just an example, A modulator for 1930s radios on Medium wave
813 screen modulated, HT for both valves 25V, O/P 1mW at 1MHz into 50ohms harmonics <-60dBm.
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Old 10th October 2008, 10:30 PM   #174
revintage is offline revintage
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Will use EL519/6KG6 instead of 6550 as anti-triode in my SEPTORS with parallelled 6B4Gs. Sims so much better, must be the high Gm. Will take some photos tomorrow when I have mounted the magnoval sockets and topcaps.
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Old 13th October 2008, 07:25 PM   #175
hoktuna is offline hoktuna  Sweden
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Location: Eskilstuna
Yesterday i move the 150H choke and hook up the scope.
The sine wave now looking good below 100 hz
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Old 3rd November 2009, 09:36 PM   #176
Elias is offline Elias  Finland
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Location: Suomi

Time to move this thread forwards!

This idea came to my mind of output toroid current compensation. For the input signal it acts like a SE amp. It works with split supply. Capacitor decouples the signal at the middle. No need for transistor current mirrors No need for current tracking, same current goes through both windings. I think some of those 115V + 115V mains toroids works fine here as in my previous protos as well.

What do you think?

- Elias
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Liberate yourself from the illusion of two speaker stereo triangle
Dipole Bass vs Monopole Bass Stereophonic Sound from a Single Loudspeaker 3 Speaker Linear Stereo Matrix Wavelets
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Old 11th March 2013, 10:35 PM   #177
Shoog is offline Shoog
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Sorry to resurrect such an old thread - but I have a question for Revintage.
I am toying with the idea of building a nice little SPUD amp using a E55L. When researching I came across this design of yours

Using mains transformer as output transformer

very interesting. I only just understood after some thinking how its DC stable. Is this still a workable design or did it develop issues in use.

Could it be adapted to use a E55L.

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