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New 36 W build, JCM 800 pre-amp
Posted: Wed 05/23/12 9:04 pm
by guitar-rocker
I just finished another 36W build, with the B+ and the power section built off of the 18W design and values, only double bubble. This amp features a quad of 6V6's, typical 18/36W B+ rails, dropping resistor values, & cathode bias. The preamp is a JCM800 2203. For the PT I used an Edcor 200ma 310-0-310, OT the MPS 42va. It has a lot of gain. A lot of gain. Pretty much it turned out about as well as the Baby Blues JTM did. Thanks to Phil for his suggestion to not lower the 470K's. And a few photo links:
http://i938.photobucket.com/albums/ad22 ... nside2.jpg
http://i938.photobucket.com/albums/ad22 ... opview.jpg
http://i938.photobucket.com/albums/ad22 ... board1.jpg
Posted: Thu 05/24/12 12:22 am
by Bronsboi
Guitar rocker, your layouts are so tidy, it makes me want to weep when I look at my amps!
How do you like the tone compared to your other 36watt builds?
Great work.
Dave Brons
Posted: Thu 05/24/12 1:25 am
by Daviedawg
Your layout is a work of art. It is a shame to hide it in the chassis.
Dd
Posted: Thu 05/24/12 5:21 am
by guitar-rocker
Thanks Davie, I try to make them tidy. Kind of like a muscle car, goes fast, but does anyone ever look under the hood at it? The tone is all that counts though.
Posted: Thu 05/24/12 5:23 am
by guitar-rocker
Bronsboi wrote:Guitar rocker, your layouts are so tidy, it makes me want to weep when I look at my amps!
How do you like the tone compared to your other 36watt builds?
Great work.
Dave Brons
Thanks for the compliment, but I fought the layout a bit, and will probably change a few things on the next one to clean it up a bit more. I think I like the 6V6 roar a bit better than the EL84, but this one is definely is an 80's toned amp.
Posted: Thu 05/24/12 10:53 am
by basicbill
Very Nice ! Thats the way my amps aare supposed to look
Ordering parts for the Phat ass today, we'll see !
Posted: Wed 07/18/12 10:23 pm
by guitar-rocker
Posted: Thu 07/19/12 5:04 am
by scottva59
Great 80s grind and a beautiful build!
Posted: Thu 07/19/12 5:18 am
by guitar-rocker
Thank you much. It hit what I was aiming for, so I'm pretty happy with the build. Ad of course Mr. Brian Story who played and recorded the clip does a very good job with his playing too!
Posted: Thu 07/19/12 12:37 pm
by lespaulplayer
That clip sounded AWESOME.
Posted: Thu 07/19/12 12:40 pm
by Bronsboi
Beautiful tone, sounds better than the Jcm I used to own! Congratulations
Posted: Thu 07/19/12 3:50 pm
by guitarmike2107
Looks and sounds great, nice work, well done!!
Posted: Thu 07/19/12 4:44 pm
by basicbill
Impressive Tone !
Posted: Thu 07/19/12 8:43 pm
by zaphod_phil
Love that tone!!!
Could you also post it into the Hear It! section, so people can find it easily later...
Posted: Thu 07/19/12 9:29 pm
by guitar-rocker
ZP, It would be my pleasure to post the clip there.
Posted: Thu 07/19/12 9:32 pm
by guitar-rocker
My thanks to all for the very nice compliments, Scott, LesPaul, Dave, Michael, Bill and Z. Phil. Thanks Michael for your excellent service on the parts, which I could not do without.
Posted: Thu 07/19/12 10:02 pm
by guitar-rocker