On topic, but......
A buck says says it's a bot!
FS - 6L6 PP Vacuum Tube Power Amp DIY Kit Complete Set (24W
5 posts
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by Geek » Tue Jul 20, 2010 4:27 pm
First post and flogging something.
On topic, but......
A buck says says it's a bot!
On topic, but......
A buck says says it's a bot!
-= Gregg =-
Fine wine comes in glass bottles, not plastic sacks. Therefore the finer electrons are also found in glass bottles.
Fine wine comes in glass bottles, not plastic sacks. Therefore the finer electrons are also found in glass bottles.
-
Geek - KT88
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by EWBrown » Tue Jul 20, 2010 9:23 pm
... Then it must be 
Note, that even though it is presented as being a 6L6 PP amp, the PC board is clearly marked with "6V6". Oopsie.......
Circuitry looks simple enough, so that "reverse engineering" can be accomplished easily from the final row of four photos...
It is. (already sussed it out)
Just think "K-502" or "K-12", but with bigger tubes...
/ed B
Note, that even though it is presented as being a 6L6 PP amp, the PC board is clearly marked with "6V6". Oopsie.......
Circuitry looks simple enough, so that "reverse engineering" can be accomplished easily from the final row of four photos...
It is. (already sussed it out)
Just think "K-502" or "K-12", but with bigger tubes...
/ed B
Real Radios Glow in the Dark
-
EWBrown - Insulator & Iron Magnate
- Posts: 6389
- Joined: Wed Mar 19, 2003 6:03 am
- Location: Now located in Clay County, NC !
by Geek » Tue Jul 20, 2010 10:40 pm
Pssst, Ed.... hotlink smilies from this directory, otherwise it don't work 
http://geek.scorpiorising.ca/contrib/Geek/smilies/
Cheers!
http://geek.scorpiorising.ca/contrib/Geek/smilies/
Cheers!
-= Gregg =-
Fine wine comes in glass bottles, not plastic sacks. Therefore the finer electrons are also found in glass bottles.
Fine wine comes in glass bottles, not plastic sacks. Therefore the finer electrons are also found in glass bottles.
-
Geek - KT88
- Posts: 3585
- Joined: Sun Oct 21, 2007 3:01 am
- Location: Chilliwack, British Columbia
by EWBrown » Wed Jul 21, 2010 10:26 am
I tried, but that didn't have the "spam" and "RAOTFLMAO" smilies
I copied the last row photos which showed the stuffed and loaded PC bpards.
It didn't take me too long to figure out the rather simple circuitry, after all with only 10 resistrors and 4 caps per channel, it wasn't too daunting a task. And two of the resistors (330 ohms and 1K, 3W) are connected in parallel to act like a 250 ohm resistor.
I suspect that a 12AX7 would be a better match than 12AU7 for the VA/PI circuit. I'll run it through Tube-CAD to determine which is better.
It's basically nearly identical the "K-502" or "K-12" schematic, just with different resistor values, bigger tubes, and no obvious NFB loop - at least its components are not on the PC board. Nothing fancy, nothing special, pretty much a "textbook" design with no originality.
/ed B
I copied the last row photos which showed the stuffed and loaded PC bpards.
It didn't take me too long to figure out the rather simple circuitry, after all with only 10 resistrors and 4 caps per channel, it wasn't too daunting a task. And two of the resistors (330 ohms and 1K, 3W) are connected in parallel to act like a 250 ohm resistor.
I suspect that a 12AX7 would be a better match than 12AU7 for the VA/PI circuit. I'll run it through Tube-CAD to determine which is better.
It's basically nearly identical the "K-502" or "K-12" schematic, just with different resistor values, bigger tubes, and no obvious NFB loop - at least its components are not on the PC board. Nothing fancy, nothing special, pretty much a "textbook" design with no originality.
/ed B
Real Radios Glow in the Dark
-
EWBrown - Insulator & Iron Magnate
- Posts: 6389
- Joined: Wed Mar 19, 2003 6:03 am
- Location: Now located in Clay County, NC !
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