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  1. Replies
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    A few hours ago I decided to jumper (?) the...

    A few hours ago I decided to jumper (?) the channels. So guitar to Normal channel 1, and then cable from Normal channel 2 to Brilliant channel 2. And it worked just fine, both channels on. I put a...
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    HTH what do you mean by "I just prefer the feel",...

    HTH what do you mean by "I just prefer the feel", do you mean it changes the sound somehow?

    I have these options:...
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    Yes, resistance reads very high. I'll go on and...

    Yes, resistance reads very high. I'll go on and keep it.
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    While changing pots I have the impression this...

    While changing pots I have the impression this component got a bit too hot.
    Is there a way to test such a small cap with a normal multi-meter?
    Or would the only option to turn on the amp with the...
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    Thanks for the comment HTH. Any recommendations...

    Thanks for the comment HTH.
    Any recommendations for type/specs of suitable choke?



    In theory this is a bass amp, but works nicely for guitar as well :-)
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    Just to have them listed here's the set of pots....

    Just to have them listed here's the set of pots.

    CHANNEL ONE



    Volume
    1M Ω
    LG A1 AB CTS
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    I've located now all of them. Volume, treble and...

    I've located now all of them. Volume, treble and bass are replicated, so the same for both channels.
    I'm now taking note of the specs of each one, which is written on them.

    500V voltage rating...
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    I've decided to change the pots. Some do strange...

    I've decided to change the pots.
    Some do strange things, like operating then fading away, if I press them a bit then clicks and change in volume happens.

    But in the schematics I can only locate 5...
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    Yes. I mean now it would be sitting around and...

    Yes. I mean now it would be sitting around and eventually used, at low volumes of course. So it would be kind of having a beast in a Zoo.
    I bet the amp wants to run free and scream loud :-)

    Of...
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    Hi all. Happy new year! I have the impression...

    Hi all. Happy new year!

    I have the impression I should replace all the pots. I've clean them with contact cleaner, but I think their effect in the sound is now what it should be.
    Channel two it...
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    Yep I did check google. In this amp the sockets...

    Yep I did check google.
    In this amp the sockets are of this type:

    51464

    Adjusting the grip of the terminals is a bit hard since they are quite deep inside.

    I think if those were like in the...
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    Now the amp is very sensible (some clicks and...

    Now the amp is very sensible (some clicks and pops) to any kicks, even hitting the wall in a nearby room causes some clicks. That's after the new valves.

    In any case the valves sit quite tight in...
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    The reading at pin 4 is 574 Vdc

    The reading at pin 4 is 574 Vdc
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    Ok, so after swapping tubes around for a while I...

    Ok, so after swapping tubes around for a while I managed to leave them like this:




    Tube 1
    Tube 2
    Tube 3
    Tube 4
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    I went and purchased a new set of matches valves,...

    I went and purchased a new set of matches valves, all four.

    Adjusting the bias I did set all four to be around 25mA using the bias probe.
    But I'm not sure what's the correct mA I should aim for....
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    51418 Pins 1 and 8 are interconnected to the...

    51418

    Pins 1 and 8 are interconnected to the bus that goes to ground.
    I can put the red probe in the Pin 8 but where does the black probe goes?
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    Good catch pdf64, yes that was Pin6 then. When...

    Good catch pdf64, yes that was Pin6 then.
    When reading at Pin 5 the values are:

    With mains ON:

    -48.2 -48.2 -47.2 -47.2

    With mains ON and Stand by ON:

    -47.2 -47.3 -46.2 -46.2
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    Reading at point C is 592 VDC. Measured here:...

    Reading at point C is 592 VDC.

    Measured here:

    51404
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    The readings are 589, 587, 589 and 589 VDC.

    The readings are 589, 587, 589 and 589 VDC.
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    So black to chassis and all measurements with red...

    So black to chassis and all measurements with red at pin 5.
    With all the tubes in place right?
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    Yes, both switches are in play mode.

    Yes, both switches are in play mode.
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    Resistors look fine from the outside. I have been...

    Resistors look fine from the outside. I have been checking their values and replaced one a few weeks ago.
    But as I mentioned, I did swap the tubes to make sure the reading was not affected by the...
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    Well the Bias tool has two probes, so black to...

    Well the Bias tool has two probes, so black to COM and red to V/ohms/mA
    I actually purchased it assembled since I screwed the first kit I got.
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    I went on and started measuring with the Bias...

    I went on and started measuring with the Bias tool I bought. I'm not planning to do this frequently but I would like to set it properly after so many years.

    Now I've been able to find which...
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    Ok. I still don't understand the advantage of...

    Ok. I still don't understand the advantage of removing the bus to Chassis, placing a 1 ohm resistor on each socket and measure VS using the bias tool I got. The first option seems even more work to...
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    Lets see if I get the idea. Ok. Cathode...

    Lets see if I get the idea.



    Ok. Cathode socket terminal in my understanding the terminal 8.
    0V is 0V Chassis?

    So should I place a ohm resistor between each terminal 8 and Chassis for each...
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    Hmm I don't know pdf64, sounds a bit complex for...

    Hmm I don't know pdf64, sounds a bit complex for my skills. Since I bought that BIAS tool shouldn't I try with that?
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    Hi again, I cleaned all the valve sockets well...

    Hi again,

    I cleaned all the valve sockets well and jack inputs and...
    I was 10 minutes trying it out and no single pop or clicks out of the amp :-)

    Now it is better. I gently hit the valves...
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