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  1. K

    2203 1978 issue

    Thanks mate.. Yeah, the tech at the studio where I work is gonna do something like that! He's got scopes and stuff, so he's gonna monitor the measurements over a period of time and get back to me. Missin ma amp though!
  2. K

    2203 1978 issue

    Thanks guys..! Def not my ears as its the same when I play it quiet at home...! So output tubes could be the culprit? Is there a way of checking the tubes before I buy new ones? Cheers
  3. K

    2203 1978 issue

    Hey guys my 1978 2203 is sounding great since I modded it last year but after about 10 mins of being on it sounds as if the gain has been turned down a little and is a tad duller! Im sure the tubes are fine and wondered if it may be the caps which are the originals? Cheers
  4. K

    Screen resistors and plate voltage

    Why what happened, did I miss something? :cheers:
  5. K

    Mercury Magnetics?

    Good question. I know that when I had the output transformer replaced with a no name brand in my 78 2203 in the nineties, some mojo was definately lost. :( Im def gonna replace it shortly.
  6. K

    Screen resistors and plate voltage

    Great info, thanks cagamp :) Absolutely, I love this forum! :dude:
  7. K

    Screen resistors and plate voltage

    Thanks Joey. I tried it a little colder, in fact I dropped it down 1ma at a time, plugged back in had a blast, down 1ma had a blast ect, all the way down to 30ma. But 37.5 seemed to hit the spot, with my batterd ears anyway :eek: Thanks Jon. I thought as much! :cool: Kiddin! Cheers...
  8. K

    Screen resistors and plate voltage

    Thanks Jon. When I checked the plate voltage about a week ago it showed 480, so I set the bias to 36ma. Today I replaced the screen resistors and out of curiosity checked the plate voltage again, which this time read 466, so I tweaked the bias up to 37ma. I presumed it was the new screen...
  9. K

    Screen resistors and plate voltage

    This is a more of a curiosity than anything else so.. Replaced the screen resistors in my 2203 today all good no worries.. Then I checked the plate voltage and it was 466, so I re-biased. Funny thing is, I checked the plate voltage a few days ago and it was 480! Presumably this is a side...
  10. K

    Bias filter caps question

    Cheers Joey and Major for the info. I can get them ordered now. ;)
  11. K

    Bias filter caps question

    Cheers Lane thats good to know, I'll go for the 160v's ;)
  12. K

    Bias filter caps question

    The bias filter caps in my 78 2203 are 10uf 100v but in the schematics Ive looked at they are 10uf 160v?? :confused: Gonna be buying some replacements so should I go for the 100v or 160v? Cheers
  13. K

    2203 mod help

    Cheers bud. I might just try that combination. :dude:
  14. K

    2203 mod help

    Cheers Bieling3. I'm wondering if its worth just replacing v1 or all 3? Ive noticed a lot of people using 3 different preamp tubes which sounds interesting! Did you ever try this? Thanks again.
  15. K

    2203 mod help

    Update: I checked the bias and re-set it to 36ma as it was set pretty cold, the plate voltage was 480. As soon as I hit a chord it sounded SOOOO.. much better! So out of curiosity I put the 68k resistor back onto the wiper and hit a chord... fuckin wicked! Fat and sooth.. Now I can turn up...
  16. K

    Troubleshooting Tone on a 78 JMP 2203

    Just wondering if you found out what replacement output transformer is recommended for a 78 2203? Cheers
  17. K

    2203 mod help

    Mmm.. interesting. As you mention, could be country specific then? Thanks bud. I notice you use a Flying V with 'the beast'...aint it a wicked combination. :thumb:
  18. K

    2203 mod help

    Hey cheers bro.. yeah, that's odd concerning the turrets.. wonder why mine doesn't have them? I noticed the heat damage to the screen grid resistors when I first decided to try the mod but did'nt have anything to compare them with to know if this was normal or not on amps this old, so cheers...
  19. K

    2203 mod help

    Ive put the 10k cathode resistor back and the amp sounds great again! Then I took the 68k resistor off the wiper and back on to the input side of the pot and it sounds even better, so many thanks for the suggestions MajorNut1967 :) Ill leave the treble peaking circuit and the bright cap off...
  20. K

    2203 mod help

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