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  1. Ed A

    Studio Vintage SV20 mods (and SC20 too)

    Thanks for the reply and sorry to bug ya all on Christmas day!.... so I will experiment with the bright cap for sure, I generally removed them completely from my vintage plexis... also for the most part I always replaced the .0022 with .02 on my vintage plexis as well... BUT, Im not much of a...
  2. Ed A

    Studio Vintage SV20 mods (and SC20 too)

    ANY MODS FOR MORE BASS? Hey guys. I just picked up a new SV20 head. I’m playing it through a 1x12 with an old JBL D120. Amp sounds great, better than I expected. I play it with High Treble volume on 8 to 9. And mixing in Normal volume at around 4 to 5. Convincing plexi tones, I just wish I can...
  3. Ed A

    The Official Marshall Studio Vintage Thread Sv20h

    ANY MODS FOR MORE BASS? Hey guys. I just picked up a new SV20 head yesterday. I’m playing it through a 1x12 with an old JBL D120. Amp sounds great, better than I expected. I play it with High Treble volume on 8 to 9. And mixing in Normal volume at around 4 to 5. Convincing plexi tones, I just...
  4. Ed A

    WTB: Marshall JTM30

    Marshall JTM30.... Any of you have one of these mid '90s amps for sale?... must be in great working order but worn condition is OK.... will need to be shipped to NY... email me at eda@optonline.net
  5. Ed A

    50w plexi tone stack question

    I'm not enough of an amp tech to answer all your questions unfortunately. But it was suggested to me to change the negative feedback resistor from 47K to 100K which did add a bit more gain. The amp has phenomenal tone it has all NOS mustards and many NOS resistors as well. And it really has the...
  6. Ed A

    50w plexi tone stack question

    Thanks for that explanation. I definitely do NOT want it to start sounding Fendery. What I love about my vintage Marshalls is just as you described, clarity on the bottom and sweet compression and distortion on the top.... I am not an amp tech but capable of fiddling around with some value...
  7. Ed A

    50w plexi tone stack question

    I have a '50w plexi clone that is sort of a combination of lead and bass head specs.... It is split cathode and has a tone stack of 56k/250p.... I would like to get a bit more gain, but I do not need more treble... I would like to try a 33k for more gain but would like to leave the 250p and not...
  8. Ed A

    Lar/Mar PPIMV power tube saturation?

    Hey Oatie, I went ahead and ordered the parts before seeing your post about the Rich II mod. I ordered everything that my Amp tech would need to do the Larmar including a Pec 250K dual. So at this point it will be the Larmar that I try. Interesting back in the 90s I tried the rich mod at Rich's...
  9. Ed A

    Lar/Mar PPIMV power tube saturation?

    Oatie. Can you tell me where you purchased the Pec pot and the Teflon wire? Thanks much appreciated.
  10. Ed A

    Lar/Mar PPIMV power tube saturation?

    Thanks guys, this is much clearer now. And thanks Oatie for the details on the parts and the great pictures!
  11. Ed A

    Lar/Mar PPIMV power tube saturation?

    Okay but one of the advantages of Read about this master is that it can be adjusted to be completely out of the circuit. So if turning it all the way up is over driving the preamp section then it's not out of the circuit. But somebody else here said that turning it to zero won't work either...
  12. Ed A

    Lar/Mar PPIMV power tube saturation?

    Hey guys I appreciate the comments and info but I think i'm not being completely clear. I know full well how power tube saturation happens, I've been playing for 40 years I've had tons of vintage equipment both guitars and amps and still do. I have a 69 100W Plexi and at 71 50W that will remain...
  13. Ed A

    Lar/Mar PPIMV power tube saturation?

    Hope you guys can answer this because I've been reading Thread after thread about this mod and I need to be clear before I install it in my 69 50W Plexi clone. For not my needs I only need to reduce volume a little bit. I use this amp with a weber attenuator. I crank the amp up to nine or 10 for...
  14. Ed A

    Do I need the metal plate under my 71 50W?

    Okay. Is it aluminum?
  15. Ed A

    Do I need the metal plate under my 71 50W?

    I just bought a small box head cabinet for my 71 50W. I'm moving it out of the big box into the small box and I'm too lazy to go out and find a metal sheet to put in there unless there is a good reason to do so?
  16. Ed A

    Royal Amps Jimmy Page Clones

    Check these amps out!... They are clones of Jimmy's Hiwatt and Marshall amps that he used in Zeppelin.... Some great sounding video demos too.... https://www.facebook...678322492232775
  17. Ed A

    Coolest Marshall JTM30 ever?

    I have heard that this mod works much better on the JTM 60 rather than 30. I understand if you do it to a 30 you can't get the amp to drive at all it stays clean. As I had mentioned the JTM30 sounds fantastic as long as you are cranking it. No fizzy diode crap happening when turned up. That's...
  18. Ed A

    Coolest Marshall JTM30 ever?

    Yeah the diode clipping thing on these amps sucks. If I play this amp with the volume less than three quarters it's a physical buzz machine from those diodes. Definitely an amp I would never use for low-volume distortion. But cranked up the diodes seem to pull out of the circuit and you really...
  19. Ed A

    Marshall JTM30 Bluesbreaker Cab Video/Soundfile

    I was asked to post a soundfile of this, my latest gigging amp so I did this video.... Had Jeff Swanson build me a custom cabinet for my mid 90s JTM30... Put a JBL D120 in it. Im sure I sound like I always do, we all seem to sound like ourselves no matter what the gear!.... But I do really like...
  20. Ed A

    Coolest Marshall JTM30 ever?

    Nope. I did one of the heat fixes recommended for this amp and I've had no trouble at all. I know many suggest installing a fan but the fix I did is much easier. I got a four-inch by 12 inch sheet of aluminum diamond plate and slipped it between the tubes and the chassis using double back tape...

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