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  1. Replies
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    Amps finished. Works great. I used a standard...

    Amps finished. Works great. I used a standard bias circuit and cap coupled the CF to the output grids. Next time I will direct couple the CF to the output grids and use a large negative bias voltage....
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    And it is cut and paste in this situation because...

    And it is cut and paste in this situation because this is an unorthadox circuit that im playing with. I would like to have it built and functioning so i can get a better understanding. Ive built...
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    Dumble SSS

    howdy folks, im nearing completion of a Dumble SSS clone. I got the board made and chassis nearly populated. BUT im working on the bias supply. im using the Fender Studio bass phase inverter for...
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    Well i didnt get the board out i just replaced...

    Well i didnt get the board out i just replaced V3a's plate resistor from the top. it was super tedious and the pad started lifting slightly. SO, if im goona do more i think i am going to remove the...
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    Yea the noise stays on v3a. so with that said i...

    Yea the noise stays on v3a. so with that said i will resolder the tube socket connectors and replace the Plate resistors on V3 and perhaps V1 while i have it apart.
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    swapped the tubes and about a month later the hum...

    swapped the tubes and about a month later the hum started.
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    That makes alot of sense haha. Ive been going...

    That makes alot of sense haha. Ive been going around in circles on this one.
    Just for clarification the grid on v3a looks good. The signal directly off the tube socket v3a plate is ugly. Thats...
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    Mesa Dual Rec Optocoupler

    Howdy folks,

    Got a friends Dual rec on the bench. Noticeable hum on both channels But i feel like im on a goose chase with this thing.it seems to be moving around when looking for it on the...
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    love it. Thanks Leo, i was thinking the same for...

    love it. Thanks Leo, i was thinking the same for the recovery control, in that you want as much signal as possible and thats a sensitive section.
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    Twin reverb Send/Return controls

    Im building a custom twin reverb but i want better control of the reverb. Send/return and level controls. working from the standard fender design40549
    Correct me if im wrong on this...
    Send level i...
  11. replaced zeners and opamp. better but still...

    replaced zeners and opamp. better but still slightly distorted reverb. Swapped pans with an old used unit. Works great now!
    I learned stuff today :-)
    Thnx everyone.
  12. Im getting 1.24v on Pin 1. pin 7 zero. This opamp...

    Im getting 1.24v on Pin 1. pin 7 zero. This opamp is in the reverb section. I suspected it was faulty.I pulled and tested the 16v zeners (C13/14). I must have mixed them up because now the positive...
  13. HAHA woops, yup the tank was connected. ...

    HAHA woops, yup the tank was connected.
    Resistors measure good now, C14 is measuring 14K. goona replace that when i pull the board. Will pull and test the zeners and resolder. how do opamps...
  14. Hotrod Deluxe Reverb/switching supply problems

    Not super familiar with SS devices but im learning. I cant tell if the TL072 (u2) is bad or not. The amp was also channel switching by itself. i replaced the two 470ohm resistors and raised off the...
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    thats a good idea. it would back up the...

    thats a good idea. it would back up the measurements. but it seems like they are 2 steps away from eachother. 2/8 for both totalling 2800 ohms for the reflected load.
    i contacted hammond about them...
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    39257 This is the condition i got it in. missing...

    39257
    This is the condition i got it in. missing vol control, 2 coupling caps and 2 of the 4 tubes were shot. good jan 5751 in the input and a nice 12at7 in the P.I.
    Reminds me alittle of how...
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    Ahhh i see now the neon is critical for the test....

    Ahhh i see now the neon is critical for the test. but i think your right enzo. its super duper loud if there was a problem with the secondary windings i would have seen it when i was playing through...
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    I removed the NFB and retested. same results. I...

    I removed the NFB and retested. same results. I think you guys are right about the mislabelling. the "8ohm" tap reflected into an 8 ohm load results in an impedance of 2800. 4ohms would be 1500. but...
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    im going to plug the wallwart into my bulb...

    im going to plug the wallwart into my bulb current limiter and test it. i got a feeling the 16ohm tap is friend. prob got a 4ohm speaker plugged into it and fried. It worked for alittle while before...
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    the OTs were made my hammond on a custom order....

    the OTs were made my hammond on a custom order. ive seen two of these exact bassman style clones locally (including mine that i bought at a salvage yard for 100$). my guess mid to late 70's as they...
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    everything is connected, but no output tubes. and...

    everything is connected, but no output tubes. and the two OT secondary taps have their own non shorting jacks. so the only wire really connected is the Primary CT.
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    no diodes. the chassis is silkscreened with...

    no diodes. the chassis is silkscreened with impedance.

    OT secondary is speaker outs not plate side.

    Im just curious if its possible to tape off the suspect OT speaker out and use the winding...
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    using a 12Vac wall wart i injected the voltage...

    using a 12Vac wall wart i injected the voltage through the secondary jacks and measured the voltage across the plate leads. i have to go secondary to primary due to my shitty DMM. I checked the...
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    OT transformer secondary issues

    howdy folks, i got a silly question.
    I am restoring an old tube bass amp i found locally on craigslist. Massive hammond iron. I emailed hammond and they indicated the units used in the amp were...
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    i mean i think the limiter is working. My...

    i mean i think the limiter is working. My mistake, yes its a 100w bulb. i use the limiter with shorted tube amps on a regular basis.
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    60watter

    60watter
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    Okay well after more digging i did indeed find...

    Okay well after more digging i did indeed find Q15 (neg rail driver) shorted. i checked Q11 and Q13 and they checked out ok. Im also doubled checked R21 R25 R24 and R25 just in case. I fired up the...
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    Gotcha! thanks Jazz! So the drivers are directly...

    Gotcha! thanks Jazz! So the drivers are directly coupled to the output Base pins!
    Is that a safe assumption then that Q14 would be a suspect ? (for example if we saw -Vdc on the speaker out we...
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