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  1. Without digging up the manual, I would suggest...

    Without digging up the manual, I would suggest that you try using the Aux Out feature.
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    It may be a 100 ohm resistor between circuit...

    It may be a 100 ohm resistor between circuit ground and chassis ground.

    That resistor being open should not 'create' a hum.

    Check each supply voltage for excess Vac ripple.

    If they are...
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    This should fit:...

    This should fit: https://www.madisoundspeakerstore.com/soft-dome-tweeters-peerless-vifa/peerless-dx20bf00-08-3/4-textile-dome-tweeter-8-ohm/
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    https://www.simplyspeakers.com/replacement-speaker...

    https://www.simplyspeakers.com/replacement-speaker-tweeter-t-123.html
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    Nice video of the reconing:...

    Nice video of the reconing:...
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    "This speaker delivers 300 watts of power to a...

    "This speaker delivers 300 watts of power to a 15″ neodymium Differential DriveŽ LF driver. The driver boasts a dual neodymium magnet and dual voice coil motor that efficiently delivers high output...
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    Here is a crop from the Cube 100. 56114 ...

    Here is a crop from the Cube 100.

    56114

    Super duper easy.
    A diode, a resistor & an LED to ground.
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    Do you have a part#? Odd is the fact that the...

    Do you have a part#?

    Odd is the fact that the ones that I have seen used a relay.
  9. I think that the bypassed screen resistor on a...

    I think that the bypassed screen resistor on a pentode tube is purely a preamp tube concept.
  10. "How created the first amp for an electric...

    "How created the first amp for an electric guitar? "
    Copied the RCA Receiver manual?
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    I have attached the Fender HR series jack...

    I have attached the Fender HR series jack switching setup.
    56063
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    Schematic: 56049

    Schematic: 56049
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    I would contact Boss with that question.

    I would contact Boss with that question.
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    Here is the schematic & board layout diagram. ...

    Here is the schematic & board layout diagram.

    56011

    It really is not that difficult to understand the drawings.
  15. Quote:"3. The connection between the pcb and the...

    Quote:"3. The connection between the pcb and the chassis is made by 2 screws in the power amp heat sink. If I try to power the circuit without this connection the hum is unbearable in both channels."...
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    Give this a read:...

    Give this a read: https://www.premierguitar.com/articles/26303-ask-amp-man-a-60s-premier-combo-gets-cleaned-up-for-dirty-work

    Premier schematics are rare.

    55998
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    https://en.wikipedia.org/wiki/Reference_designator

    https://en.wikipedia.org/wiki/Reference_designator
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    As to the issue of pulling Vdc to power the fan,...

    As to the issue of pulling Vdc to power the fan, it really does depend on the power supply.
    I had a PRO Audio power amp (2 in fact) in that had a 7mv hum on the outputs.
    It went away when I...
  19. Thread: Gibson G70

    by Jazz P Bass
    Replies
    16
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    2,881

    Here is the schematic with the correct...

    Here is the schematic with the correct orientation of Q6. (it is a NPN transistor)

    Edit: The LTP (Q3 & Q4) where drawn as PNPs when in fact they are NPN transistors.

    55935
  20. Thread: Gibson G70

    by Jazz P Bass
    Replies
    16
    Views
    2,881

    Thank you for the schematic J M Fayhey!!! I...

    Thank you for the schematic J M Fayhey!!!
    I could not find this oddball version anywhere.
    Kudos to MEF.

    I got one of these jewels in with the MJE1102/ 1092 transistors installed.
    Of coarse they...
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    "Black Face" a Silverface amp????? WTH is that...

    "Black Face" a Silverface amp?????

    WTH is that supposed to mean?

    What, remove all of that gadly wire?
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    I found a few pics online. 55921 55922 55923...

    I found a few pics online.

    55921
    55922
    55923

    The third pic shows the amp connector.
    It appears that the lower pin is larger than the other two.
    That is going to be a tough one to find.
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    Here is the power amp schematic of the Power 10....

    Here is the power amp schematic of the Power 10.
    There is indeed a zener across a capacitor.
    16V / 1/2 watt.
    55893

    And the complete schematic: 55894
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    What do the two pads connect to? The Power 10...

    What do the two pads connect to?

    The Power 10 shows a 'D5" being a 12 V zener diode.

    55885
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    Looking at the schematic I notice there are a...

    Looking at the schematic I notice there are a number of 0.1uf bypass capacitors on the IC power rails (C42-C45).
    One or more may have gone short.
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    Try contacting them:...

    Try contacting them: https://www.altoproaudio.com/contact
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    Here is the SM: 55866

    Here is the SM: 55866
  28. The bottom half of the output is being cut off....

    The bottom half of the output is being cut off.
    If you look at your voltages you will see a lot of Minus dc measurements.
    That is hint.

    That said, solid state amps can be a real bear to repair....
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