Compactron amp... LIVES!

roline · 20th November 2010, 04:00 AM

Just finished stuffing the board and applied power without speaker global feedback. The Monster lives, but with the global output feed back, less gain and is much better behaved, more refined sound quality.
6U10 for input and LTP driving 6JN6 (or 6JM6 with plate cap) output tubes running in triode mode. Pots for balancing and adjusting output current worked, running 40ma Iq with less than .001 volt mismatch across the 10ohm resisters.
This is my first tube amp project, PCB was a challenge with the ironed toner resist method, used same method for front component identification..
eyelets for all through holes for wiring and back mounted caps.
Next, try different output transformers, refinement and put into a box.

Next project selected is a KT88 design driven by 6N6H Russian tubes LTP and 6SN7 front end to allow for tube / tone character selection.
SO many tubes, SO little time....

Wavebourn · 20th November 2010, 04:50 AM

Congratulations!

Very nice, real DIY amp!

ReinoutdV · 20th November 2010, 04:55 AM

Good morning Roline,

congratulations with the Compactron-amp.
For my last amplifier i used Compactrons as well. First a 6HV5 for the combined task as input/driver for the 35TG. It worked....but did not sound nice. Then i switched to the dual-different-triode-family (6FY7, 6FJ7, 6FM7) with great results. The first triode inside the Compactron as input; the second as driver.

As you said: so many tubes; so little time. And the variety of Compactrons is amazing; the price as well.....

Lots of luck with the building. Enjoy your creation.
Regards, Reinout

vinylkid58 · 20th November 2010, 06:05 AM

That's a super cool amp, congrats. Very compact board layout for a PP amp.

jeff

Wavebourn · 20th November 2010, 06:16 AM

Looks cool, but substations that have such voltages have shields and scary pictures... It is more dangerous than electric chair, because it looks cool, and don't resemble a killing machine! I mean Reinout's picture.

piano3 · 20th November 2010, 05:32 PM

Just looking at Reinout's(beautifully made) amp scares me!

roline · 20th November 2010, 06:11 PM

I have a design that uses 7193 and 615 mickey mouse tubes, all with top cap connections.... to drive the outputs. There are several output tubes also with the plate cap....
Something to keep the finders out of. I was under the impression that it was done for capacatance reduction for a higher power band width..

kevinkr · 20th November 2010, 08:03 PM

Nice as those all metal plate caps look, I'm far more comfortable with ceramic ones or an enclosure.

That PCB look just awesome, obviously a lot of care and trouble went into its design and fabrication..

rsumperl · 21st November 2010, 02:02 AM

Hi,
Great job! Can you post a schematic?

Thanks,
Ray

roline · 21st November 2010, 09:11 PM

Latest Schematic....

20th November 2010, 04:50 AM	#2
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	Congratulations! Very nice, real DIY amp! __________________ If I disappear suddenly, that means I finally created a time machine and pushed wrong button that brought me to Stalin's Russia. In any experiment any result is the result. Even if it is negative.

20th November 2010, 06:16 AM	#5
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	Looks cool, but substations that have such voltages have shields and scary pictures... It is more dangerous than electric chair, because it looks cool, and don't resemble a killing machine! I mean Reinout's picture. __________________ If I disappear suddenly, that means I finally created a time machine and pushed wrong button that brought me to Stalin's Russia. In any experiment any result is the result. Even if it is negative.

20th November 2010, 08:03 PM	#8
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	Nice as those all metal plate caps look, I'm far more comfortable with ceramic ones or an enclosure. That PCB look just awesome, obviously a lot of care and trouble went into its design and fabrication.. __________________ "Extraordinary claims require extraordinary evidence." - Carl Sagan

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Another compactron PP output	engels	Tubes / Valves	15	22nd September 2011 03:03 AM
Compactron Output Tubes	audiowize	Tubes / Valves	10	18th June 2008 01:38 AM
When is a compactron not a compactron?	ray_moth	Tubes / Valves	4	28th December 2007 11:31 AM
Zen Headphone Amp Lives (Sort of!)	metalman	Headphone Systems	45	26th April 2004 10:25 PM


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

20th November 2010, 06:05 AM	#4
vinylkid58 diyAudio Member Join Date: May 2005 Location: Victoria, B.C.	That's a super cool amp, congrats. Very compact board layout for a PP amp. jeff

20th November 2010, 05:32 PM	#6
piano3 diyAudio Member Join Date: Aug 2010 Location: London,UK	Just looking at Reinout's(beautifully made) amp scares me!

20th November 2010, 06:11 PM	#7
roline diyAudio Member Join Date: Sep 2010 Location: East Tennessee	I have a design that uses 7193 and 615 mickey mouse tubes, all with top cap connections.... to drive the outputs. There are several output tubes also with the plate cap.... Something to keep the finders out of. I was under the impression that it was done for capacatance reduction for a higher power band width..

21st November 2010, 02:02 AM	#9
rsumperl diyAudio Member Join Date: Oct 2009 Location: Warren Center, PA	Hi, Great job! Can you post a schematic? Thanks, Ray

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read