Maybe the amplifier was originally set up for 6550s. Check out the bias circuit here:
https://mhuss.com/MyJCM/JCM800_2204.gif
Search found 557 matches
- Thu Apr 11, 2024 8:26 am
- Forum: Marshall Discussion
- Topic: Bias voltage range on JCM-800?
- Replies: 5
- Views: 466
- Tue Feb 27, 2024 9:51 am
- Forum: Garage Talk
- Topic: Wish me luck
- Replies: 62
- Views: 4313
Re: Wish me luck
Ha! Ain't it true. I never talk with the family (wife's anyway) since the ONLY time they call me is when they want something. Leeches.Probably because every time I talk to friends or family they want something from me so I just avoid em anymore.
- Sat Jan 27, 2024 11:27 am
- Forum: Fender Discussion
- Topic: Rivera designed Super Champ layout?
- Replies: 12
- Views: 1144
- Wed Dec 27, 2023 11:45 am
- Forum: Technical Discussion
- Topic: Interesting video on current flow
- Replies: 7
- Views: 2150
Re: Interesting video on current flow
Very cool video. I know what he means by o-scopes being limited.
This would make a good topic for a Masters thesis.
This would make a good topic for a Masters thesis.
- Tue Dec 12, 2023 9:01 am
- Forum: Garage Talk
- Topic: Guitar Gallery Thread! Post 'em up!
- Replies: 804
- Views: 305909
Re: Guitar Gallery Thread! Post 'em up!
Ohhh. Those are very nice.Forgot to update. I finished the matching Strat recently.
- Mon Dec 04, 2023 9:45 am
- Forum: Technical Discussion
- Topic: A Question Of Tone...?
- Replies: 7
- Views: 4059
Re: A Question Of Tone...?
Check the variation in preamp wiring from these two otherwise identical amplifiers. https://www.drtube.com/schematics/marshall/2019.gif https://www.drtube.com/schematics/marshall/2022.gif One channel of each is emphasizes the bass freqs and the other is brighter (with a 500 pF peaker cap parallel to...
- Wed Oct 18, 2023 8:45 am
- Forum: Technical Discussion
- Topic: Kay 703-based design
- Replies: 13
- Views: 7489
Re: Kay 703-based design
Are you using a 1/2 wave rectifier in the amp? Might be a source of hum.
- Sun Oct 01, 2023 9:15 am
- Forum: Garage Talk
- Topic: Thinking about moving south
- Replies: 152
- Views: 78066
Re: Thinking about moving south
Don't delete! This has been an entertaining thread. Unlike you my mother lives ~1000 miles away. Hard for me to pack up and move (to "NA" - Muscle Shoals area) as my wife's family is local here (Southern Tier NY). A lot of us think we live in a 5hithole. You are not alone my friend!
- Sun Oct 01, 2023 9:11 am
- Forum: Technical Discussion
- Topic: Effects loop for SV20ish amp
- Replies: 17
- Views: 9706
Re: Effects loop for SV20ish amp
Attached is the layout I developed.
If I were to do it again, I'd add true bypass to the loop (switch). As designed the loop is persistently in the signal path.
If I were to do it again, I'd add true bypass to the loop (switch). As designed the loop is persistently in the signal path.
- Sat Sep 30, 2023 12:44 pm
- Forum: Technical Discussion
- Topic: Effects loop for SV20ish amp
- Replies: 17
- Views: 9706
Re: Effects loop for SV20ish amp
Why yes, yes it was. so far a waste of my money and time I have built that loop several times - no issues. Put one in my son's JCM-800 clone, my 1987 clone and a single ended amplifier. I added trimmer pots but I don't think they are really necessary. Chorus and Reverb sound great. I haven't tried ...
- Sat Sep 16, 2023 10:17 am
- Forum: Garage Talk
- Topic: Thinking about moving south
- Replies: 152
- Views: 78066
Re: Thinking about moving south
Gulf Coast you say? Mobile, Alabama . Hands down the friendliest place on earth. I spent part of a summer and fall there working on a flight simulator for the USCG. Locals were super nice. Weather (early 90s) was much more tolerable in the summer than say Orlando or W.Palm Beach, Florida where I fir...
- Thu Aug 24, 2023 8:16 am
- Forum: Garage Talk
- Topic: Crimanly underrated
- Replies: 25
- Views: 10103
Re: Crimanly underrated
+1, at least. I thought his work with Muddy Waters was fantastic.
- Sun Jul 30, 2023 11:13 am
- Forum: Speakers and Cabinets
- Topic: Vox-style grillcloth patented | legal issues?
- Replies: 27
- Views: 31574
Re: Vox-style grillcloth patented | legal issues?
Kind of reminds me of Dimarzio's patent for cream colored Humbuckers. How can you patent a color? There is no such thing, it is a visual perception.
- Thu Jun 08, 2023 8:39 am
- Forum: Marshall Discussion
- Topic: jtm 45 build issues
- Replies: 18
- Views: 4615
Re: jtm 45 build issues
Hopefully this will help. I have had trouble on more than one occasion where I had a 470K resistor in place of a 470R resistor at the PI cathode. This resulted in a very low volume sound. Might be worth a check there.
I really hope you find the issue. JTM45s are awesome sounding amplifiers.
I really hope you find the issue. JTM45s are awesome sounding amplifiers.
- Mon Mar 20, 2023 8:29 am
- Forum: Garage Talk
- Topic: What're you listening to right now??
- Replies: 1184
- Views: 361180
Re: What're you listening to right now??
I could listen to this album all day: https://www.youtube.com/watch?v=l-5aPNxv-pU
IIRC Al Kooper dissed this song as stupid. Fuck you Al.
RIP Garry Rossington.
IIRC Al Kooper dissed this song as stupid. Fuck you Al.
RIP Garry Rossington.