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    Helmholtz, It's been a while since I have worked...

    Helmholtz, It's been a while since I have worked on any amps that use four 6L6 tubes. Next time I do, I'll come back here with further observations.
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    Chuck H, Indeed, I become more and more aware of...

    Chuck H, Indeed, I become more and more aware of this, and more and more disappointed that these manufacturers are doing this. The owner of the above mentioned Harbinger speakers is the lead vocalist...
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    Hello everyone, It's been a while, and the amp...

    Hello everyone,
    It's been a while, and the amp in question is long gone back to a happy customer. I have had more of these sort of amps in my shop, and I find the same issues with them all...they...
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    David, Indeed, the bass side (E and A) had more...

    David, Indeed, the bass side (E and A) had more of a problem than the other. I went ahead and swapped the two wires on the bass pickup. It improved it some, but not perfect. I suppose this is the...
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    Thank you all for your thoughts. Helmholtz,...

    Thank you all for your thoughts.
    Helmholtz, not sure what you mean by "reverse wiring", however, this schematic shows how the bass is now wired. I looked up wiring schemes, and I often see this as...
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    A cancelling effect between pickups

    I thought I could fix anything, but this one has me stumped. Some help from you experts would be greatly appreciated! Concerning a Fender P bass. The neck pickup is the original split pickup style....
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    JM, Of course....I appreciate your wisdom....

    JM,
    Of course....I appreciate your wisdom. Sometimes it is not prudent to make assumptions. So, including the corrected schematic here one more time for anyone out there that is attempting to...
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    JM, thanks for your scolding! Indeed, the 6.5mfd...

    JM, thanks for your scolding! Indeed, the 6.5mfd figure is one I pulled out of the air, based on my experience working with crossovers. And, Helmholtz, I agree with you, since the other speaker works...
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    I received the other crossover from the customer....

    I received the other crossover from the customer. It is in working condition. I promptly measured the capacitors. The 1.5 is indeed 1.5. The larger white cap measured .6mfd. This surprised me. I was...
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    Nevetslab, Thank you for the test procedure for...

    Nevetslab, Thank you for the test procedure for testing these caps. I am well aware of this procedure. Suffice it to say, I have determined without any doubt that these two caps are bad, and need...
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    Helmholtz, Ha! You're right, indeed the choke...

    Helmholtz, Ha! You're right, indeed the choke does stay in the circuit...my mistake.
    Anyone out there care to make an educated guess as to the value the 6.5mfd cap should be? Should it be, indeed,...
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    Helmholtz, Indeed, the 45 resistor and choke ARE...

    Helmholtz, Indeed, the 45 resistor and choke ARE out of the circuit in normal mode. Look at the connections to the relay contacts. The 45 resistor is shorted in normal mode. Anyway, what I am after...
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    Juan, Indeed, measured the caps - both bad!! I...

    Juan, Indeed, measured the caps - both bad!! I took another look at the unit as I suspected I made an error in the schematic, but no, the schematic is correct. Upon initial use of this crossover, the...
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    Juan, thanks for your continued help. I wrote in...

    Juan, thanks for your continued help. I wrote in 4 and 4 just as a guess, as 8mfd would be a typical value for a tweeter crossover. Indeed, the yellow cap would be either a 1.5 or 15. So a good guess...
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    TomCarlos, This crossover is hardly hacked! It...

    TomCarlos, This crossover is hardly hacked! It was I that "hacked" it. I would prefer to call it "cut out" the two defective capacitors. They need replacement. As you can see in the photo, the...
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    53131

    53131
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    Thanks, guys, for your thoughts. Indeed, I...

    Thanks, guys, for your thoughts. Indeed, I neglected to read the writing on the crossover panel "self resetting overload protection". So, JM, looks like you are right on in circuit explanation....
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    Cerwin Vega V30X speaker cabinet

    Hi, all,
    Wondering of anyone here can help me understand the workings of these Cerwin Vega V30X speakers? No simple crossover. There is a relay in there that is energized by the input signal with...
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    51929 Vertical is 10v per division, 1khz, taken...

    51929
    Vertical is 10v per division, 1khz, taken at speaker output.
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    Hi, Thank you so much for all your wisdom,...

    Hi, Thank you so much for all your wisdom, suggestions, and thoughts. I continue in this new year with this Fender Bassman dilemma. Indeed, still no idea how to get this amp to output more than 50...
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    Alexradium, I have substituted a known good...

    Alexradium, I have substituted a known good output transformer with no change...still 50watt output. I agree, not the greatest idea to run a single tube, but I thought for test purposes for a few...
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    OK, disconnected the negative feedback resistor....

    OK, disconnected the negative feedback resistor. (I assume that is what you guys mean by "NFB"). No change in output....still 20vRMS. Reconnected that resistor, and did the individual tube and socket...
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    Hi guys, and thanks so much for your continued...

    Hi guys, and thanks so much for your continued help with this amp of mine! So, I made some progress today. I received the new 12AT7 in the mail today and was excited to install and see what happens....
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    By the way, thought I would mention, there is a...

    By the way, thought I would mention, there is a 12AX7 for the phase inverter. The schematic calls for a 12AT7. My understanding is that the 12AX7 has more gain, so this should not be a factor?
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    Hello, fellow techs, I'm finally back, with...

    Hello, fellow techs,
    I'm finally back, with the Fender Bassman on the bench. The first thing I did was install my tube extender to check bias. The extender places a 1 ohm resistor in series with...
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    Thanks so much for your thoughts. I have another...

    Thanks so much for your thoughts. I have another unit on the bench at the moment, so haven't yet gotten back to the bassman.
    Randall, Thanks for your idea, but have already tried that. No change....
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    Did some more work on the Fender super bassman....

    Did some more work on the Fender super bassman. Today, the lines voltage at the amp is 120v. This is with the amp running at full power with output waveform slightly distorted. I also decided to...
  28. Thought I would add my 2c...Don't forget all...

    Thought I would add my 2c...Don't forget all those units out there that have the multi layer boards, and trying to desolder a multi pin amp module. I tell the customer I will try, but tell them it's...
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