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Vacuum Tube OTL power amp!!
Vacuum Tube OTL power amp!!
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Old 2nd October 2011, 09:17 PM   #161
Alastair E is offline Alastair E  Wales
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I have about 120V on the anode, and a little less on the grid of the phase-splitter...

Sounds like you're nearly there!
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Old 2nd October 2011, 09:33 PM   #162
M Gregg is offline M Gregg  England
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Thank's,

I still have to complete the 6c33c wiring...

Also mount the FETS. A bit busy at work at the moment.
Its getting there.LOL

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M. Gregg
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Old 3rd October 2011, 10:09 PM   #163
M Gregg is offline M Gregg  England
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Just more progress,

Driver/ pre board completed.




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M. Gregg
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Old 5th October 2011, 09:33 AM   #164
M Gregg is offline M Gregg  England
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Post 162#

Error - S's & N's....late night...lol

Should say DC heaters for the 6SL7's and AC for the 6SN7.

Markings are wrong on pic 2 should have 2x 6SL7 and 1X 6SN7.
Now corrected

Wiring is correct to schematic. <<< accepting numbers for pin out should be 6SL series tube.

Back on track I guess...

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M. Gregg

Last edited by M Gregg; 5th October 2011 at 09:37 AM.
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Old 5th October 2011, 12:30 PM   #165
M Gregg is offline M Gregg  England
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Just to show correctly.

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M. Gregg
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Old 6th October 2011, 02:56 PM   #166
M Gregg is offline M Gregg  England
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Just some more progress

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M. Gregg
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Old 6th October 2011, 06:48 PM   #167
flatheadmurre is offline flatheadmurre  Sweden
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Very inspiring thread.

Getting the itch, must not start another build

A nice toroid for the input tubes HT and heater perhaps ?

Then itīs all toroid powered.

The amp is looking good !!
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Old 7th October 2011, 12:02 AM   #168
Alastair E is offline Alastair E  Wales
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Looking very nice....

My only concern, is the gate-stoppers for the mosfets....

They look to be mounted some distance from the fet itself, so could cause an issue.
--Bit difficult to see, as there's sleeving by the fet terms.

Personally, I mounted the zener diode and the G.S. actually on the fet itself....

But, Looking a very nice bit of construction, puts mine to shame! I'm getting quite excited for you now its nearing completion, Hoping it runs as good as it looks!
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Old 7th October 2011, 12:18 AM   #169
PiCBuRn3r is offline PiCBuRn3r  Greece
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Hi, this amplifier is a AB class one ?
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Old 7th October 2011, 11:25 AM   #170
Alastair E is offline Alastair E  Wales
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Yes, it would be AB1 as we are not driving the grids positive...
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