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PapaMidnite

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Everything posted by PapaMidnite

  1. Thanks Gil time to put this one to bed .I think I'll work on my Guitar chops instead
  2. OK forget the loop idea .Onto next Question. I would like to add a Bias pot adjustment. Looking at scheme where is Bias resistor located?I seem to be overlooking it.Too many late nights
  3. Anyone care to weigh in on this one?I'm pretty sure where your talking about but want to be sure.[Please use references]
  4. .http://www.ppwatt.com/files/ppwatt/E...VER01_DPPT.pdf .Where would you??
  5. That's what has me going . I think I'm going to let this one go. I have a Carvin T 100 with 34's and an ADA MP-1 pre that I would like to piggyback to the Bc .I'm also going to isolate the speakers so I can use either amp with a splitter. I am also looking into an effects loop and maybe a vibrato I think this amp should have had one . Have you looked at the schematic of this amp? And if so Where would you add the loop?[ Someone said maybe Kt77's ] I had to give it one more shot.:- Thanks Gil
  6. Ok this is where i'm at I did the cap mods .Im thinking about the EL34 mod .My Question is can the Output trany handle it?
  7. to answer my own question, it does not appear to be wired to take EL 34. If anyone wants to try that, first off you need to make the following mods: 1. - Hard wire pins 1 and 8 together on the output tube sockets, or better yet, hard wire pins 1 straight to ground. 2. - Change R45, & 46 to 1k/5W. 3. - Change R42, & 43 to 5.6k/1/2 W With these mods, you can go back and forth between EL34 and 6L6 by just swapping the tubes.
  8. I think this is what your looking for.http://www.ppwatt.com/files/ppwatt/E...VER01_DPPT.pdf That'll get it. Let's do this conservatively. Remove ONE cap, then play and see if it's better (to your ears) or still needs less brightness. If it needs less, remove one more and then re-play. Etc. First - remove C6. Second - C5 Third - C10.
  9. Ok here's a post from another site about EL34 tube swap idea I've been toying with .What do you think ??? An chanOK Tremo, here's the amp specs, straight from Pyotr Belov: Straight out of the Box BC30 with stock Sovtek 5881 - Line Voltage 120 Sovtek 5881 Plate 23W dissipation + Screen 3W dissipation. B+ Voltage - 406VDC - Measured from Pin 3 to ground Plate Voltage - 375VDC Measured from Plate to Cathode Screen Voltage - 374 VDC Measured Pin 4 to Cathode Cathode Voltage - 31VDC - Measured from Cathode to ground Cathode Bias Resistor - 250 Ohm Rated 25W Cathode Current - 62mA per tube These specs were at idle. I spoke with Pyotr on the phone tonight. He seemed to favor the 6L6GC for a replacement output tube, but he said that any 5881/6L6GC should be alright in this amp. While we were on the phone, Pyotr popped in a pair of EL34's and got these numbers: B+ 396v, Plate 367V, 28.5v Cathode voltage, 57mA per tube, Line Voltage 116v. I'm going to run these numbers by Lord Valve to get his opinion....minus the 6550 recomendation that is...ce of op trans failure?or do you think it will handle it?
  10. The real difference between 6l6 and 5881's is that the 5881's will break up a little earlier[ imop.] from the testing I have done .But these amps are made on the bright side according to Gibson r&d depart. That's why i clipped some caps To lesson the brightness these amps are made to do .With the next mod I'm working on I will be able to add EL34's for some British flavor .I also tested with EL84's Very articulate Breaks up much sooner for that deep tube drive. But more defined drive. Bass all the way up ,Trem at 12:00 and Mids from 1 to 3:00 depending on the song I would say more of a Vox AC30. Roll back the volume and you definitely get a Marshall tone .I fired up a Fender Bass man for a side by side using a Tele and if you closed your eyes you would be hard pressed to tell the difference
  11. I noticed the front of the amp is different
  12. Yes the schematic is accurate.So are the mods.Although tubes will make some difference it's the other mods that do the trick .I'm just waiting for the 1K resistors to come in then onto the El34 mod
  13. http://www.ppwatt.com/files/ppwatt/EPIPHONE_BLUES_CUSTOM_30_SCHEMATIC_VER01_DPPT.pdf This is where I found mine .I play some harp through this amp it's so/so. You would be betteroff playing through a Mic'ed 5 watt amp.I'll try it with the EL84's and let you know
  14. Going to do more mods today. This is for an EL34 tube swap.Should be correct.First Ground tube pins #1 Then replace Resistors R45 &R46 With 1K /5Watt .Then R42 & R43 With 5.6 - 1/2 watt I should now be able to switch between EL34's and 6L6's .I have been wanting to try this for awhile any comments??
  15. Definitly do the cap cut mod .It's amazing how much better it sounds .I got the idea after seeing and hearing it done to a Valve jr .I don't know why they make amps so bright these days
  16. If you think this amp is too bright sounding try this mod .Open er up find C6 cap and cut .Pull it back slightly. Now fire it up and listen to the difference.If that is not enough Cut C5 [.This was enough for me ].Again not enough C10 [.have not gone here yet .] The brightness is gone the EQ way more tweak-able .I am Jumping between Tung-sol 5881's and a THD yellow jacket with el84's that's right 84's with these this amp cooks .Also Weber speaker diffusers and for God sake put it on an amp stand .This is a jaw dropping experience .This is how this amp is supposed to sound
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