Ghost Notes Solved

  • Thread starter Thread starter glip22
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glip22 said:
Thanks. 75 Superlead. Its fully recapped and has 50uf/50uf caps. I suspect the 100K plate resistor has drifted up. I am reading 164K but this is in circuit so it can be hard to tell. Teh 82 k reads 80k in circuit. PI is very closely balanced as well as power tubes are matched. Can the 100k plate resistor cause this?
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It should read close to 100K in circuit. I'm guessing that's your problem.
 
glip22 said:
Thanks. 75 Superlead. Its fully recapped and has 50uf/50uf caps. I suspect the 100K plate resistor has drifted up. I am reading 164K but this is in circuit so it can be hard to tell. Teh 82 k reads 80k in circuit. PI is very closely balanced as well as power tubes are matched. Can the 100k plate resistor cause this?
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If you have tubes that you know are good. Run a pair in the middle 2/3 see if it does it. If it does run a pair on the outside 1 and 4 and see if does it.
 
cliffc8488 said:
It should read close to 100K in circuit. I'm guessing that's your problem.
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Thanks. We will see. I'm waiting for the Pihers to deliver from Spain
panhead said:
If you have tubes that you know are good. Run a pair in the middle 2/3 see if it does it. If it does run a pair on the outside 1 and 4 and see if does it.
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I did try this earlier on and still have it. It's not bad but more than I care for TY
 
panhead said:
How much you want for it LOL :yes:
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LOL. There's more to it. It's an Elan Metalhead. Elan has an added tube that hits the circuit after the stock stages right before the cathode follower. This allows the amp to go from clean to mean with barely any volume loss better than any other mod I have played. When the pull pot is in the amp is fully stock. Literally, all stock , every part. The only difference is now the leads are shielded. The amp still ghosts a little when the added two gain stages are fully out of circuit so it is not the mod. I know Elans work, I have an 85 he did and I put the same mod in an 89 and it rips. I tweaked the circuit of course to my ear. Teh cathode caps he uses 22uf are too big. I will not alter the originals though.
 
If you are going to replace it with a Phier eventually why don't you install a modern CF that measure exactly correct 100K and you'll know for sure if that was your problem. If that fixes it then install the Phier when you get them.
 
harddriver said:
If you are going to replace it with a Phier eventually why don't you install a modern CF that measure exactly correct 100K and you'll know for sure if that was your problem. If that fixes it then install the Phier when you get them.
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Actually found a Piher today in my pile that measured right at 100K. When I got the amp, I found the plate voltage on the PI on the 100K side quite low, so I tested the resistor. I pulled it today and it tested 164k out of circuit (big drift up). I replaced it, and one of the bias splitters that was testing 238, and the issue is corrected. If you really listen closely on the neck pickup higher registers most of the old Marshalls have it at volume to some degree but this 75 SL was very bad in many areas and on the bridge pickup also. Now it's fixed Bingo.
 
Excellent news! :2thumbsup:

Thanks for updating us. :yes: This will be invaluable information for troubleshooting purposes in the future for someone having a similar issue.

So you replaced one of the bias splitter resistors as well?
 
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Glad you got it figured out.

I didn't understand much of what you guys were talking about but it was interesting :yes:
 
Extremely informative thread. My understanding of how , what , and why just grew. Solves a lot of puzzles.
 
harddriver said:
Excellent news! :2thumbsup:

Thanks for updating us. :yes: This will be invaluable information for troubleshooting purposes in the future for someone having a similar issue.

So you replaced one of the bias splitter resistors as well?
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Thanks. Just because I replaced the splitter to have both closer in resistance. Had the board up so why not.
 
glip22 said:
LOL. There's more to it. It's an Elan Metalhead. Elan has an added tube that hits the circuit after the stock stages right before the cathode follower. This allows the amp to go from clean to mean with barely any volume loss better than any other mod I have played. When the pull pot is in the amp is fully stock. Literally, all stock , every part. The only difference is now the leads are shielded. The amp still ghosts a little when the added two gain stages are fully out of circuit so it is not the mod. I know Elans work, I have an 85 he did and I put the same mod in an 89 and it rips. I tweaked the circuit of course to my ear. Teh cathode caps he uses 22uf are too big. I will not alter the originals though.
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I just bought a 75 superlead with this metalhead mod by Elan Memran. I was trying to understand what the extra 2 knobs do once the extra gain mod is engaged.
 
glip22 said:
Actually found a Piher today in my pile that measured right at 100K. When I got the amp, I found the plate voltage on the PI on the 100K side quite low, so I tested the resistor. I pulled it today and it tested 164k out of circuit (big drift up). I replaced it, and one of the bias splitters that was testing 238, and the issue is corrected. If you really listen closely on the neck pickup higher registers most of the old Marshalls have it at volume to some degree but this 75 SL was very bad in many areas and on the bridge pickup also. Now it's fixed Bingo.
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Bumping Gary's thread as I've had the same problem with my late 68/early 69 Supertrem. The PI plate resistors all tested good, splitters as well. My amp seems to be a transition amp as the Mains filtering is old school Plexi at 32/32/350, while the pre is more 70s at 50/50/500. The ghosting is insane in this amp, it sounds like a bad chorus pedal lol. The amp is very Gainy too, straight in dimed....
I upped the Mains filter Cap to 50/50/500 and problem solved. I have a few old Dalys here from when I experimented with a 72 50w I had. This amp sounds like a boosted 2203 now that I can hear it clearly without that horrible 'warble' ghosting issue.
 
Fryette Memphis was the best playing amp I’ve ever owned…. Except for the ghost notes. God they were awful.
I did everything I could to reduce them but I eventually just accepted that an amp sagging in the sweet spot is gonna have ghost notes.
I never noticed them with a band but once I went home and cranked the amp into an IR loader and listened through the microscope of headphones, it was just unbearable for me.

I eventually accepted my fate as a basement player in this stage of my life and some amps just aren’t gonna work for me anymore
 
Please feel free to diagnose my 6505+… I don’t have ghost notes, the whole amp ghosted me….
 
Dan Gleesak said:
I’ll read through the thread a bit.
I’d still be grasping at straws but maybe it will be different straws lol
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I'm very much an amateur with tech stuff; I'll see what's already been suggested and maybe there's some random thing I read in the past that might help.
 
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