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Old 8th February 2014, 07:21 PM   #1
diyAudio Member
Join Date: Dec 2005
Location: Loganville, GA
Default drdwers

Hello drdwers,
this is what I'm listening to now. Much better then the dynaco.
Attached Images
File Type: jpg 6BQ5-PP.JPG (74.3 KB, 189 views)
File Type: jpg 6BQ5PP-stuff.JPG (65.5 KB, 181 views)
File Type: jpg 6BQ5PP-fin.JPG (56.0 KB, 174 views)
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Old 8th February 2014, 08:06 PM   #2
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Richard Ellis's Avatar
Join Date: Sep 2006
Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.
Nice PP Bruce! Got some more pictures? Kinda hard to tell what you've created here...seems your amp is butted up against another unit I see.
Curious & kinda dangerous with the exposed PC board....here's hoping no one near is taken to touching anything there.......ZZaapppp! Perhaps your not done quite yet?

__________________________________________________ __Rick...........

Last edited by Richard Ellis; 8th February 2014 at 08:07 PM. Reason: typo
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Old 8th February 2014, 09:02 PM   #3
diyAudio Member
Join Date: Dec 2005
Location: Loganville, GA
Thanks Richard,
All safety issues are very well addressed.
Your correct, I have a 6V6 SE on one side of the PP and on the other side is a 6BQ5 SE. All pc board are my own creation as are the chassis.

Attached Images
File Type: jpg 6BQ5-PP.JPG (36.6 KB, 160 views)
File Type: jpg 6BQ5-se.JPG (54.5 KB, 155 views)
File Type: jpg 6V6-se.JPG (92.4 KB, 100 views)
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Old 8th February 2014, 09:24 PM   #4
TheGimp is offline TheGimp  United States
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Join Date: Aug 2009
Location: Johnson City, TN
Looks nice.

You might want to change R8 and R9 from 1/2W to 1W as the working voltage rating of the 1/2 W resistors are typically 250V. 1W resistors generally have a rating of 350V or greater.
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Old 8th February 2014, 10:50 PM   #5
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Join Date: Dec 2005
Location: Loganville, GA
Thanks Gimp, I'll look into it. This is a clone of a Pilot 505 amp. I used the values shown on the schematic. I'm not an EE, just a cludger.
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Old 9th February 2014, 12:03 AM   #6
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Join Date: Jul 2012
R11 seems a little to big and can be rolling off the highest frequencies of the audio spectrum, as a quick experiment you could put in parallel with it another resistor of say 15k with alligator clips and listen carefully to see if you can hear an improvement in the sound. Try listening to the hi-hat and cymbals in a suitable song to make the difference audible (if any).

Also you can try playing with the values of R5 and R6 to fine tune the phase inverter, you can momentarily wire a 500k pot and play around until you find the sound you like, then measure the resistance of each branch and replace the pot with the closest value resistors you can find (In fact leaving the pot isnīt so bad of an idea IMHO because if you replace the 12ax7 you can readjust easily the phase inverter)

Other than that it is a neat build, enjoy it.
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Old 12th February 2014, 05:16 AM   #7
drdwers is offline drdwers  United States
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Join Date: Dec 2013
Location: Pennsylvania
Nice work Bruce. I see where you are going with. I will toss this around
once again very nice job!!

Build safe and Listen back.
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