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  1. Replies
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    Thank you sir--i will have a closer look

    Thank you sir--i will have a closer look
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    Ive got it up and running. Pair of Sovtek 6550...

    Ive got it up and running. Pair of Sovtek 6550 in it. Voltage at the plates is 438vdc , bias is good . Interesting sounding amp..... awful high gain tones but back off the gain and its not bad .
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    i will have to ask the owner

    i will have to ask the owner
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    might be time to shop for new PT

    might be time to shop for new PT
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    I tried a 5U4 , it put out 582V. what tube...

    I tried a 5U4 , it put out 582V.

    what tube would work here ?
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    54-13 ...

    54-13

    http://akdatabase.com/AKview/albums/...ansformers.pdf
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    the power trans is Huge...OT looks the size of a...

    the power trans is Huge...OT looks the size of a 50 or 100w . Both have solid black covers...no brand on them.

    part number on PT is 54-13 138839

    OT is 51-14 138826

    edit... looks...
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    ive got a mesa 5U4 here somewhere what...

    ive got a mesa 5U4 here somewhere


    what about 6550s / kt88 in this thing?
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    pics

    pics
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    Ok---new socket --all wired up. the 5y3 rect...

    Ok---new socket --all wired up.

    the 5y3 rect is putting out 566vdc

    measuring the power tube sockets with no tubes =
    pin 1 0v

    2 and 7 have 6.9vac heater volts

    3 has 566vdc
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    i will after i replace the socket----cheers

    i will after i replace the socket----cheers
  12. Replies
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    home brew = mystery amp

    Someone brought me a home made tube amp to fix. No tubes in it . Needs a power tube socket . Its got 2 octals..pin 1 and 8 are tied then go through a 1 ohm to ground ....1K screen...
  13. have you pulled the main pcb out of the amp and...

    have you pulled the main pcb out of the amp and inspected the joints on the bottom? ive seen a lot of those amps with cracked joints.

    You said you have 0 vdc at pin 6 of a pre-tube but the plate...
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    Found a rare gem of a deal recently --- A...

    Found a rare gem of a deal recently ---

    A couple months ago , i saw a Fractal Axe Fx preamp on FB marketplace--it was a local pawn shop. I went down there first thing in the morning. At the time...
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    well.... i tried re-seating all the multi pin...

    well.... i tried re-seating all the multi pin connectors in the pre amp and loop pcb...that seemed to do it...Ch1 works great now .
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    Thanks..no go on jumpering each ldr. I see all of...

    Thanks..no go on jumpering each ldr. I see all of them change from about 18v to 6v or less...when i switch channels..except ph106.it stays at 18v.
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    no scope what voltages should i see on the...

    no scope

    what voltages should i see on the control side? the ldr 's has 4 legs..2 close together and 2 wider apart. Ill try the jumper
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    Rivera troubles

    Ive got a Venus 6 here , the amp works great on Ch. 2 but i have zero sound on Ch. 1 .
    The venus 5 scem can be seen here : https://elektrotanya.com/?q=showresult&what=Rivera

    waiting to...
  19. Thread: Rivera

    by Valvehead
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    thanks---i wonder how close the 5 model is , to...

    thanks---i wonder how close the 5 model is , to the 6
  20. Thread: Rivera

    by Valvehead
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    Rivera

    looking for Venus 6 scem
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    yes all grounds good

    yes all grounds good
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    ill try the hair dryer thing. i do have 2vdc ...

    ill try the hair dryer thing.

    i do have 2vdc at the outside lug of the volume on the vibrato ch.
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    yes all sockets/ jacks/ pots. There are 2 pots...

    yes all sockets/ jacks/ pots. There are 2 pots that are still scratchy,,after several attempts. Both Volumes
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    ok - thanks !!

    ok - thanks !!
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    all caps. any joints i didnt use i re-flowed....

    all caps.

    any joints i didnt use i re-flowed. No change in noise

    the noises are without the rev tank plugged in and rev pot on 0 ....if that matters. I do have a fender reverb transformer...
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    the amp made all that noise before i evened...

    the amp made all that noise before i evened opened it. Replaced caps because the owner wanted all NEW caps. Im saving all the old parts for him .

    i was looking at the Mojo boards. I wonder if...
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    Noisy ol Deluxe reverb

    Ive got a 66 DR here...owner wanted it re-capped , cleaned, re-tubed , etc...

    Ive replaced every cap in the amp , the resistors above the 6v6 sockets and plate resistors. Verified all grounds
    ...
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    Havent found the problem----even tried a separate...

    Havent found the problem----even tried a separate 6.3v filament trans ....went back through all the grounds...ALL the grounds .....im stumped.

    heres the hum--amp is on about 4 on the mv .
    ...
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