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  1. Replies
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    Just a heads up if you decide to mod the amp........

    Just a heads up if you decide to mod the amp..... Being a Project Manager by trade, I have learned to utilize a "Change Process" when working on electronics. I make a list of changes that I want and...
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    Juan... you mentioned Bob Pease..... I had the...

    Juan... you mentioned Bob Pease..... I had the pleasure to meet and work with Bob during my time at National Semiconductor (many years ago). I can vouch for the photos that are online. His desk...
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    Speaker EIA Codes Chart

    For reference, see attached... Speaker Manufacturer (EIA) codes. Courtesy of "Tube Amps 101."
  4. You might have a problem posting files if your...

    You might have a problem posting files if your account is new. So tell us if you see any numbers on the PC boards. I found that other thread by googling your amp and "music electronics forum." So...
  5. Take a look at this thread - maybe it has the...

    Take a look at this thread - maybe it has the correct schematic? https://music-electronics-forum.com/showthread.php?t=46827
  6. Have you tried to insert a signal into the "Main...

    Have you tried to insert a signal into the "Main In" jack? That would tell you if the Power Amp section is working properly. Conversely, you can take a cable from the "Pre Out" to another amp to...
  7. In addition to Mick's suggestion, clean the pots...

    In addition to Mick's suggestion, clean the pots with DeoxIT F5 (the one with a lubricant) and the jacks. Dirt or corrosion will make it harder for a signal to pass. Here is a video showing you how...
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    Schematic on this thread -...

    Schematic on this thread - https://music-electronics-forum.com/showthread.php?t=39761
  9. Yes, it sounds like you may have a problem with a...

    Yes, it sounds like you may have a problem with a "physical" connection. Take some time to check the solder joints, especially those on the pots. Make sure any connectors are secure. Make sure the...
  10. The odd thing is that you say you tried another...

    The odd thing is that you say you tried another electric guitar and you get the same result?

    So it is odd that you have a guitar, with the volume set wide open, you get a relatively clean sound,...
  11. As JPB noted, this amp is designed for an...

    As JPB noted, this amp is designed for an Electric Acoustic guitar. A guitar that has a built in preamp system will produce a higher output compared to an electric guitar that has magnetic pickups. ...
  12. Does that mean is sounded "fine" or "distorted"...

    Does that mean is sounded "fine" or "distorted" with the second electric guitar?
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    How about Gun Stock Finish (followed by GS Wax)...

    How about Gun Stock Finish (followed by GS Wax) or Minwax Tung Oil Finish? Take a look at this video. Guitar Neck Refinishing : Ibanez RG270 Project
  14. Good start to your work. As for the Bulb...

    Good start to your work.

    As for the Bulb Limiter, I wouldn't use it when playing the amp. During play, the amp will be pulling more current- so of course the bulb will light up brighter. Now that...
  15. Creating the Omega symbol

    Randall....

    When using MS Word, I use the font called "Symbol". I start in Ariel, I type the letter "W" as a cap, I select that "W" and change the font to Symbol. I then get the Omega...
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    Is this one of those (tube) amps where you need...

    Is this one of those (tube) amps where you need to make sure the speaker is grounded to the chassis? I remember having a similar problem with an old Gibson Ranger amp. There were two leads coming...
  17. I'm not sure if this makes a difference.... but...

    I'm not sure if this makes a difference.... but when you say "pushed the drive button" ... are you talking about the button on the amp or the button on the foot switch?
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    Take a look here -...

    Take a look here - https://elektrotanya.com/dean_markley_k-150_sch.pdf/download.html

    Looks like you can also buy the schematic from MusicParts.com.
  19. I would love to have a cheapo curve tracer - one...

    I would love to have a cheapo curve tracer - one that could test for Vce. But I just don't have the room and budget for an old Tektronix!
  20. Are you talking about R3 and R6? 100ohms, 5w? ...

    Are you talking about R3 and R6? 100ohms, 5w? Don't you have 1 resistor for both V1 and V2 and another for V3 and V4?

    And what about the voltages for R155 and R159? There are notes on the right...
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    Harold.... To me, Series Resistors and Voltage...

    Harold....

    To me, Series Resistors and Voltage Dividers are synonymous. Take a look at this entry level video from the Khan Academy. I believe it is a good starting point for conversations.
  22. And this thread has a copy of the schematic -...

    And this thread has a copy of the schematic - https://music-electronics-forum.com/showthread.php?t=49389&highlight=Rivera+Venus
  23. JMF - I believe that is the BEST alternative. ...

    JMF - I believe that is the BEST alternative.

    The other option here is to ask my friend, do you always keep that control pushed In or Out? If that is the case, we abandon the switch.

    I was...
  24. BTW - according to Owners Manual .... Gain Pot...

    BTW - according to Owners Manual ....

    Gain Pot (Boost Section) - Controls the amount of Drive and degree of Overdrive required. When the control is pulled forward, the Master EQ is switched in to...
  25. If I could only hold my ruler steady.... I do...

    If I could only hold my ruler steady.... I do have some plastic calipers. Maybe time to get a nice one.

    It looks like the Bushing length on the installed pot is 15/32", 11.9mm.

    The difference...
  26. Thanks Gents.... I saw the pot at Full...

    Thanks Gents....

    I saw the pot at Full Compass. It looks similar to the one at Amp Repair Parts except for the legs. And yes JMF, you are correct. The female threads on this pot are different...
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    It turns out there is another thread on this site...

    It turns out there is another thread on this site that you might review - https://music-electronics-forum.com/showthread.php?t=19251&highlight=Peavey+Bass+Amp+Max115

    It sounds like a similar...
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    Welcome.... Did you ever hear this amp working...

    Welcome....

    Did you ever hear this amp working before you bought it? How do you know the speaker is good?

    And did you try a different instrument and cable?

    Did you test the amp by...
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