Hello all someone asked me to build a "mini" major with 2 KT88's, but I am having trouble sourcing a schematic that is fully legible. Anyone have a clear one. My main questions are regarding the V2b cathode resistor values and the Bias feed resistor values, 82k?
Lastly, I was asked to install a PPIMV. It seems the "rich II" style seems like the best option. Any thoughts, advice?
I plan to use a JTM 45/100 PT to get 560+ on the plates. I will use a 100 watt OT with 40% taps for the ultra-linear connections.
Thanks!
Marshall "mini" major Build questions
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Marshall "mini" major Build questions
Amps: diy SLO, Splawn QR, YBA-1
Cabs: Scumback, Rockit, Deizel
Speakers: Scumback M75, Cel. V30, wgs hm75
Guitars: Suhr, B.C. Rich
Cabs: Scumback, Rockit, Deizel
Speakers: Scumback M75, Cel. V30, wgs hm75
Guitars: Suhr, B.C. Rich
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Re: Marshall "mini" major Build questions
The bias splitters read 68k and the v2b cathode resistors are 2k7 in series with 100k
http://www.drtube.com/schematics/marshall/1978u.gifhttp://www.drtube.com/schematics/marshall/1966u.gifhttp://www.drtube.com/schematics/marshall/1966.gifhttp://www.drtube.com/schematics/marshall/1967u.gif
http://www.drtube.com/schematics/marshall/1978u.gifhttp://www.drtube.com/schematics/marshall/1966u.gifhttp://www.drtube.com/schematics/marshall/1966.gifhttp://www.drtube.com/schematics/marshall/1967u.gif
http://www.myspace.com/20bonesband" onclick="window.open(this.href);return false;
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Super 100 amps: 1202-119 & 1202-84
JTM45 RS OT JTM50 JMP50 1959/2203/34/39
http://www.myspace.com/prostitutes" onclick="window.open(this.href);return false;
Super 100 amps: 1202-119 & 1202-84
JTM45 RS OT JTM50 JMP50 1959/2203/34/39
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Re: Marshall "mini" major Build questions
Here is the build:
Amps: diy SLO, Splawn QR, YBA-1
Cabs: Scumback, Rockit, Deizel
Speakers: Scumback M75, Cel. V30, wgs hm75
Guitars: Suhr, B.C. Rich
Cabs: Scumback, Rockit, Deizel
Speakers: Scumback M75, Cel. V30, wgs hm75
Guitars: Suhr, B.C. Rich
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- Senior Member
- Posts: 94
- Joined: Sun Dec 27, 2009 9:29 pm
- Just the numbers in order: 7
- Location: Southern California
Re: Marshall "mini" major Build questions
More progress:
Amps: diy SLO, Splawn QR, YBA-1
Cabs: Scumback, Rockit, Deizel
Speakers: Scumback M75, Cel. V30, wgs hm75
Guitars: Suhr, B.C. Rich
Cabs: Scumback, Rockit, Deizel
Speakers: Scumback M75, Cel. V30, wgs hm75
Guitars: Suhr, B.C. Rich
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- Senior Member
- Posts: 5054
- Joined: Thu Apr 13, 2006 1:36 pm
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Re: Marshall "mini" major Build questions
Beatiful! (although I don't like the sound of metal oxide resistors, even in the power supply)
http://www.myspace.com/20bonesband" onclick="window.open(this.href);return false;
http://www.myspace.com/prostitutes" onclick="window.open(this.href);return false;
Super 100 amps: 1202-119 & 1202-84
JTM45 RS OT JTM50 JMP50 1959/2203/34/39
http://www.myspace.com/prostitutes" onclick="window.open(this.href);return false;
Super 100 amps: 1202-119 & 1202-84
JTM45 RS OT JTM50 JMP50 1959/2203/34/39
-
- Senior Member
- Posts: 94
- Joined: Sun Dec 27, 2009 9:29 pm
- Just the numbers in order: 7
- Location: Southern California
Re: Marshall "mini" major Build questions
Amp is done....
Here you go:
https://www.youtube.com/watch?v=MXvhPS6lTXY
https://www.youtube.com/watch?v=aBADx0TlrCI
Here you go:
https://www.youtube.com/watch?v=MXvhPS6lTXY
https://www.youtube.com/watch?v=aBADx0TlrCI
Amps: diy SLO, Splawn QR, YBA-1
Cabs: Scumback, Rockit, Deizel
Speakers: Scumback M75, Cel. V30, wgs hm75
Guitars: Suhr, B.C. Rich
Cabs: Scumback, Rockit, Deizel
Speakers: Scumback M75, Cel. V30, wgs hm75
Guitars: Suhr, B.C. Rich
- wdelaney72
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Re: Marshall "mini" major Build questions
Cheers!
That is a great sounding amp!
That is a great sounding amp!
Walter
"There's no great thing in being a soloist. I think the hardest thing is to play together with a lot of people, and do it right." - Angus Young, 1984
"There's no great thing in being a soloist. I think the hardest thing is to play together with a lot of people, and do it right." - Angus Young, 1984
- thetasigma
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Re: Marshall "mini" major Build questions
Just curious what brand and spec transformers you went with? Amp looks and sounds awesome.
-Nathan
"Eagles may soar, but weasels don't get sucked into jet engines."
"Eagles may soar, but weasels don't get sucked into jet engines."