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  1. Replies
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    Ok! Thanks all of you for the great information....

    Ok! Thanks all of you for the great information. Since the MM is stock as I bought it in 82 I think a good work around would be just find a nice 40 or 50 watt el34 that was designed that way.
    BTW...
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    6l6 to el34 tube swap?

    I'm sure many will think this is a question that we all should know the answer to so I may be the only one. I have a MMRD50 with 6l6's and wondered if el34's could be substituted for them with out...
  3. I just noticed that the Raw Control is a separate...

    I just noticed that the Raw Control is a separate pot in addition to the Mid pot. I know Hasserl has an Attitude Mod in which a pot controls the NFB in the PI circuit and wonder if the Raw is similar?
  4. Thanks Jazz! By experiment I'm not quite...

    Thanks Jazz!
    By experiment I'm not quite sure I know what you mean? Since it would not be a switch to bypass the tone stack completely, as in a PAB switch I assume there will still be...
  5. Can I "Raw Control" or Tone Stack bypass pot?

    My Carvin VT50 has a 25k pot on the Midrange control. I do not know the Allen Amp raw control circuit but wondered if I could replicate it by increasing my Mid pot value to say 100K. That would...
  6. Opinions are just that. I'm not so into...

    Opinions are just that. I'm not so into "alternative facts". What sounds good is subjective. Design principles are important guidelines when building an amp. When modifying an amp it is likely...
  7. Nice sounding sound/video clips pdf64! Not being...

    Nice sounding sound/video clips pdf64! Not being a EE I sometimes look to "tone guru's for opinions. But I am aware that not everything you read on the Net is true or factual! I do try to verify...
  8. Interesting inputs. So why an AT over a AY in the...

    Interesting inputs. So why an AT over a AY in the PI position? And please explain the need to change the plate resistors for the AT or AY in the PI position?
  9. 12AY7 PI tube, good, bad or ugly? Your thoughts please.

    Morning! I have put a 12AY7 in my Carvin Belair (VT50) style amp. EL84's ect. I seem to be getting a bit more compression in the sound which also seems to add some touch sensitivity to my picking?...
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    No preamp Chuck H. Thanks Enzo,it may be a week...

    No preamp Chuck H. Thanks Enzo,it may be a week before I can tear it down and start checking voltages. BTW some time ago I adjusted the bias up in the low to mid 80's. I can't remember if the problem...
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    Ok, finally got to plug into the FX Return jack...

    Ok, finally got to plug into the FX Return jack and I still have a distorted sound with hard pick attack! So does that sound like caps or tubes? If caps which ones? Thanks again in advance. Your...
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    Dave H, I read up on Rob's page and it is exactly...

    Dave H, I read up on Rob's page and it is exactly what I was looking for. Thanks!!
    Thanks again to all that responded, greatly appreciated!
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    Thanks for the link Dave H, I'll read up on it!...

    Thanks for the link Dave H, I'll read up on it! Chuck H, I realize that the early breakup and interaction between the channels is a great asset and the draw of the 5e3 and popular with many. I enjoy...
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    Thanks JPB! And thanks again for the input on the...

    Thanks JPB! And thanks again for the input on the 5e3 mod!
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    Thanks for the feedback JPB. I may agree but...

    Thanks for the feedback JPB. I may agree but without trying it I would never know.
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    Need help with 5e3 volume/tone mod, please.

    I built a 5e3 that I like, however. I would like to mod it to remove the volume/tone interaction to see if I like it. Trouble is searching the internet I find several different variations of the mod...
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    Thanks g1! I greatly appreciate the response....

    Thanks g1! I greatly appreciate the response. That should tell me if the problem is in the preamp or output stage. Should the output of the guitar will be sufficient to drive the output tubes or will...
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    Carvin VT50 problem, need help please.

    My older VT 50 head is in need of some help. When I hit the strings hard I get a buzz/electronic noise,(definitely in the amp). I think this could be a cap issue (which ones?), but then again maybe a...
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    5e3 Volume mod?

    Morning all! I am aware of some of the various mods to extend the headroom of the 5e3 so that breakup comes in later. My question is can the circuit be modified such that both channels are "bright"...
  20. Thanks to Mike, Chuck and Richard for being a bit...

    Thanks to Mike, Chuck and Richard for being a bit more concise! I was actually looking for engineering comparisons as well as tonal!
  21. Got it. Thanks much.

    Got it. Thanks much.
  22. Carvin Belair/Nomad/VT50 circuit design question?

    I have a Carvin VT50 and since it is an EL84 based tube amp I wondered if the circuit is related to any other EL84 amps and if so which one's? Thanks!
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    Great Job!! It's nice to see "from scratch" and...

    Great Job!! It's nice to see "from scratch" and thinking outside the box when it comes to tweed or tolex. The carbon fiber is way outside the box, I wonder if it comes in tweed ;).
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    Ken, I just read your post and although I don't...

    Ken, I just read your post and although I don't have your issues with my RD50 there are a couple of other mods you may be interested in. Check the following links....
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    Thanks for the input! I appreciate everyone's...

    Thanks for the input! I appreciate everyone's idea's and opinions. Although this will be my first amp build I believe I have enough electronics background to get me through. My intention is to build...
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    I want to build a flexible 5E3!

    I have finally decided to build a 5E3! This will be my first amp build but want to build it so I can swap 6V6, 6L6, and 5881's. Can this be done, if so how? I have posted a similar question on...
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    I would like to thank everyone that has responded...

    I would like to thank everyone that has responded to this thread for taking their valuable time and sharing their knowledge. I know some about electronics but none has involved tubes. JM Fahey Could...
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    Sorry again, that did not work as planned either....

    Sorry again, that did not work as planned either. The attachment did not work as I expected it to. The link only appears to work if you are a member of amp garage and are signed on. I will try...
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