FS: Vacuum Tube Monoblock Power Amp Kit

cuibono · 11th December 2010, 07:02 PM

Backstory: I used to work with a well known designer of tube recording gear. He gave me this schematic, and I was helping another friend build them. That was 5 years ago, and this kit is still sitting in box in my garage. It is almost done, I'd estimate it would probably take me about 10 hours to finish (I've built a few of them). Anyway, the friend seams to have abandoned it, so I'm putting it up for sale.

I've attached the schematic for people to check out (and you may be able to figure out who designed it). Each monoblock uses two 6BM8 tubes and a Hammond 1608 output transformer. In all, each channel is rated at 12W, but my pair worked out to closer to 8Wpc.

The parts were probably about $350 total. I'd like $275 plus S/H, and the kit includes everything you'd need to finish them. I'm open to finishing it for someone, if they'd like to pay me. I still have my pair, and like them a lot. Contact me at peglegpatrick AATTT gmailDOTTTcom - I will eventually forget to check this thread...

rmyauck · 12th December 2010, 02:17 AM

Hi,

What's the input tube?

Thanks in advance!

Randy

aardvarkash10 · 12th December 2010, 02:37 AM

same as the output.

The ecl821 (6bm8) has a triode and pentode in the one envelope

Check out the schematic - four devices, but only two envelopes

rmyauck · 12th December 2010, 03:02 AM

Hi,

I got thinking that must be one of those combo tubes and did a quick search fiinding its a Triode/Pentode.

Thanks aarvarkash10!

jmillerdoc · 12th December 2010, 04:01 AM

Other than being UL the output stage appears to be biased very similar to the K502 kit which sounds very nice. It uses 10BM8 tubes which I understand are essentially the same except for the filament voltage. This is a great deal considering they want $190 for that kit and it only comes with a board to mount on and isn't mono block either. If I didn't already have four different amps in the works right now I would buy this in a heartbeat.
Jeff

katana2112 · 13th December 2010, 04:11 PM

What would shipping to CA 95386 be?

cuibono · 16th December 2010, 02:18 AM

Probably about $15. email me at peglegpatrick ATTT gmailDOTTTcom for more info
Thanks!

cuibono · 16th December 2010, 02:19 AM

Thanks Jeff for the props!

cuibono · 20th December 2010, 08:01 PM

No adventurers?

cuibono · 30th December 2010, 03:39 AM

nom nom nom

12th December 2010, 02:37 AM	#3
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	same as the output. The ecl821 (6bm8) has a triode and pentode in the one envelope Check out the schematic - four devices, but only two envelopes __________________ Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012

13th December 2010, 04:11 PM	#6
katana2112 diyAudio Member Join Date: Jan 2008	What would shipping to CA 95386 be? __________________ Aggressively Passive

16th December 2010, 02:18 AM	#7
cuibono diyAudio Member Join Date: May 2006 Location: City of Angles	Probably about $15. email me at peglegpatrick ATTT gmailDOTTTcom for more info Thanks! __________________ double complete rainbow all the way!!

16th December 2010, 02:19 AM	#8
cuibono diyAudio Member Join Date: May 2006 Location: City of Angles	Thanks Jeff for the props! __________________ double complete rainbow all the way!!

20th December 2010, 08:01 PM	#9
cuibono diyAudio Member Join Date: May 2006 Location: City of Angles	No adventurers? __________________ double complete rainbow all the way!!


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12th December 2010, 02:17 AM	#2
rmyauck diyAudio Member Join Date: Apr 2009 Location: Northern Manitoba	Hi, What's the input tube? Thanks in advance! Randy

12th December 2010, 03:02 AM	#4
rmyauck diyAudio Member Join Date: Apr 2009 Location: Northern Manitoba	Hi, I got thinking that must be one of those combo tubes and did a quick search fiinding its a Triode/Pentode. Thanks aarvarkash10!

12th December 2010, 04:01 AM	#5
jmillerdoc diyAudio Member Join Date: Mar 2009 Location: Lawton, OK, USA	Other than being UL the output stage appears to be biased very similar to the K502 kit which sounds very nice. It uses 10BM8 tubes which I understand are essentially the same except for the filament voltage. This is a great deal considering they want $190 for that kit and it only comes with a board to mount on and isn't mono block either. If I didn't already have four different amps in the works right now I would buy this in a heartbeat. Jeff

30th December 2010, 03:39 AM	#10
cuibono diyAudio Member Join Date: May 2006 Location: City of Angles	nom nom nom __________________ double complete rainbow all the way!!

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