I'm not sure if anyone here watches Adventure Time or their kids watch it but this last episode had something cool in it. It looks to be a PP guitar amp to me. I thought I would post it for you guys to check out. Does anyone recognize the circuit?
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My guess is this low power 6L6 phase inverter guitar amplifier.
http://www.ampbooks.com/home/amp-technology/6L6-phase-inverter/6L6-phase-inverter-amp.gif
But it is just a guess...
http://www.ampbooks.com/home/amp-technology/6L6-phase-inverter/6L6-phase-inverter-amp.gif
But it is just a guess...
Wonder what this would sound like as a regular monoblock amplifier... Looks straightforward enough to try, but not sure what it might be missing in terms of tonal range and inputs (that skill level is way beyond my scope).
IN the first screenshot it is interesting to note the number of tubes. six orange ones in the lower rt corner, and several blue ones all over.
Kind of low B+.
EF86 screen voltages look reasonable so if you up the B+ you will have to change the screen resistor values.
Scratch the tone circuit.
personally, I'd change the two first tubes to 6AU6s, but that's because I have a bunch.
Oh! I just noticed the cathode voltage and cathode resistor. That 5.6K 5W resistor has to be changed or eliminated and the 200R resistor changed.
Kind of low B+.
EF86 screen voltages look reasonable so if you up the B+ you will have to change the screen resistor values.
Scratch the tone circuit.
personally, I'd change the two first tubes to 6AU6s, but that's because I have a bunch.
Oh! I just noticed the cathode voltage and cathode resistor. That 5.6K 5W resistor has to be changed or eliminated and the 200R resistor changed.
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I believe these are the droids you are looking for:
http://www.ampbooks.com/home/amp-technology/6L6-phase-inverter/6L6-phase-inverter-amp.gif
http://www.ampbooks.com/home/amp-technology/6L6-phase-inverter/6L6-phase-inverter-amp.gif
An externally hosted image should be here but it was not working when we last tested it.
The B+ pretty much has to be kept that low, if one intends to combine phase-inversion with power amplification, doesn't it?
Stph
On the second screen-shot there is some non-sense symbols in the front-end of the PS...& some out of place connections.
__________________________________________________Rick..........
__________________________________________________Rick..........
Not really. The Odd-Watt uses this topology with KT88s.
The earliest article I've seen was "COMPACT HI-FI POWER AMPLIFIER" By Melvin Leibowitz.
Compact 6 Watt Amplifier
I would be surprised it there were not other references that pre-date it.
It really is nothing more than an LTP using output tubes. The large tail resistor helps hold down distortion.
I didn't recognize it at first as I think of low power in the 1-3W range and I now believe this design is aimed at subWatt output.
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