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Old 12th July 2013, 04:59 PM   #21
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Old 12th July 2013, 11:04 PM   #22
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Quote:
Originally Posted by tinitus View Post
anyway, what is the reasoning for using solid state devices ?
Now there is a good question. Using a tube input stage and solid state output stage saves some money on output transformers and power supply chokes. You do have to be careful not to throw out the baby with the bath water by having the SS stage clip before the tube stage does. That will just give the worst of both worlds.

On the other hand, using a solid state input to drive a tube output will save money by using fewer tubes. The money can then saved to pay for the output transformer and power supply choke. Some say that the distortion in the output transformer is part of the magic valve sound and without it there is no point to any tubes in your amplifier.

Have I got it right or are there other considerations?

Last edited by ingenieus; 12th July 2013 at 11:15 PM.
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Old 12th July 2013, 11:15 PM   #23
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Originally Posted by ingenieus View Post

Have I got it right or are there other cosiderations?
isolated small signal solid state input curcuit, converting single ended signal to balanced
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Old 13th July 2013, 12:18 AM   #24
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A SS device for the Concertina/Cathodyne phase splitter makes good sense ( eliminates the filament to cathode breakdown issue, and increases the voltage swing available from a given B+, the high gm reduces the cathode follower distortion).

Composite (SS +tube) Darlington or Sziklai duals allow one to eliminate the OT (and eliminate the power tubes) while still having a tube-like clipping action. If you still want an OT in there, then use a 1:1 or 4:1 bifilar one with the composite drive setups for super feedback bandwidth thru the OT.
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Old 13th July 2013, 04:59 AM   #25
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Bleed resistor across 0.7VBE doubles as a constant current source.
R4 in my drawing, keeps V1b's plate on a constant current loadline.
Its a freebie, so why the heck not take full advantage of it???

Also all filaments at ground potential, could run off one winding.
Another potential savings in cost and complexity.

Last edited by kenpeter; 13th July 2013 at 05:11 AM.
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Old 13th July 2013, 08:03 AM   #26
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what if the SS concertina was used in an earlier stage and drive the driver tubes instead?
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Old 13th July 2013, 09:06 AM   #27
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Driver tubes (or sand) only necessary if going into A2.
Even then, its only because the coupling caps essential to any
concertina will block DC and pump up a deep negative bias...
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Old 13th July 2013, 09:21 AM   #28
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like this ?
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File Type: gif ss phase splitter.gif (12.2 KB, 188 views)
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Old 13th July 2013, 11:18 AM   #29
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Originally Posted by tinitus View Post
like this ?
yes...
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Old 13th July 2013, 11:29 AM   #30
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Originally Posted by kenpeter View Post
Driver tubes (or sand) only necessary if going into A2.
Even then, its only because the coupling caps essential to any
concertina will block DC and pump up a deep negative bias...
the MJ15035 is dissipating about 3.5 watts, the highest i have seen in a concertina if looking at historical circuits....

what if we bias a tube at those levels instead? like a 13FM7, small triode driving the big triode, i know that gain will be lower....
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