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  1. Replies
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    Aha, ok well here's the whole amp then The DC...

    Aha, ok well here's the whole amp then
    The DC source to inject is the common circuit type, two resistors and smoothing cap.

    thank you...
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    DC Inject onto lifted heater center tap

    Just verifying that I can do this with this type of Hammond PT and rectifier?

    thanks.
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    Well I tightly twisted those speaker wires. Would...

    Well I tightly twisted those speaker wires. Would also shielding them help?
    Also, I looked up the PT and it for a 100W with a 2KΩ primary. I see 50 Watters have almost twice that. There is no...
  4. OK, I jumpered the ground to the switched ground...

    OK, I jumpered the ground to the switched ground and now it still doesn't power up. So I'll try and follow the +15 voltage downstream and see where it is interrupted...
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    Also those secondary OT speaker wires: should I...

    Also those secondary OT speaker wires: should I just tightly twist them? They pass right under the preamp!
  6. Yes, ground is switched. With the jack out, there...

    Yes, ground is switched. With the jack out, there is no path from the battery Negative to a circuit ground, as per suggestion. With Positive, yes.
    The replacement jack has a non-pedal size barrel....
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    If I can get the old can caps off, then I have...

    If I can get the old can caps off, then I have some larger clamps that perhaps I can resize and use (forgot to add the proper ones to the CEDist order). I'll make a paper template strip first soas to...
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    Alright that is all good news. Especially, Mick...

    Alright that is all good news. Especially, Mick replying that he's "been there" with this type of amp. And it'll be much easier. My first cap attempt was ages back, a Ampeg VT22. That didn't go well...
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    By "working fine", though vague, I meant as to...

    By "working fine", though vague, I meant as to the design. Actually the choke is gone and hence turning it on at the seller's, produced no sound. So I have to sub in a resistor first.
    I am going to...
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    Traynor YBA (JMP type) Recapping

    So, as I'm not sure if I wish to really keep this classic '72 amp in the JMP tradition - trying to figure out the best way to recap it. I have all the parts shipping. I will be using terminal...
  11. Yamaha THR - DC in jack switching, what's what?

    Anyone know which is switching on this DC jack, the +'ve or is it the -'ve?? The jack is completely busted so... just want to boot the unit up for now.
    Here is the replacement part but I doubt the...
  12. OK cool, just what I was hoping fine answer and...

    OK cool, just what I was hoping fine answer and we have three here. Thank you.
    I did no know about the cap + resistor setting that frequency.

    May it serve him well...
  13. Orange AD200b Bass head- but guitar cap values?!

    I just repaired one of these. Now I see the .022 preamp caps. are these big enough to allow some good bass frequencies to pass? The owner has some nice basses so I'm tempted to add or parallel some...
  14. Thanks for the reply, the was generally what I...

    Thanks for the reply, the was generally what I was thinking with the bridge - a gate of some sort. Well it all works, thank God!
    I like how the schematic says, "Adjust vale for high end tone." Well,...
  15. Rivera M100 I returned the amp but it's just 10...

    Rivera M100
    I returned the amp but it's just 10 mins away. But I'll ask him to find out! He agreed to upgrade the tank.
    I just loved the Hammond reverb sound.

    Thanks.
  16. What's going on with all the extra diodes here?

    LEDs 401 and 402 look to be the usual clipping diodes. But what of the rest? I see one lights up on the panel when overloaded.
    This circuit is bass heavy and mushy in that regard. There could be...
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    OK, just put it back together. The dirty channel...

    OK, just put it back together. The dirty channel is just rather bassy due to the 1uF cap there and the circuit kinda in parallel with itself anyways, Centaur like?!
    All the amp really needed was...
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    Jazz Chorus - mod to crunch circuit

    Should I bother? A friend just scored an olde Roland in trade and it works great. Perhaps a minor tweet to this discrete circuit is advisable or leave it stock and use a pedal.
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    I since recapped the PS, added a loop and a Line...

    I since recapped the PS, added a loop and a Line Out with a 30Ω attenuator off the OT secondary. I even put it direct into the Line in of an Audient iD22 interface. So one can record it with multiple...
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    Super high B+ issue, tube amp

    Getting some HIGH voltage, like 700V with this Bogen and have had to series-up pairs of filter caps to accommodate.
    If I can add a dropping resistor after the screens, R75, for the PI what would be...
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    Well I live in the country and and new parts are...

    Well I live in the country and and new parts are scarce so I swapped in a pair of 5uF caps. But also inserted an additional 2.2KΩ at R16 which adds some "headroom" to the speed adjustment (only...
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    Alright thanks and apparently I'd already...

    Alright thanks and apparently I'd already resisted with VinylEngine prior!
    Do you think that I could swap in the 5uF for the 3uF caps, might they be close enough? They're in the middle of the att....
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    Turntable speed cap value

    I have a Akai Ap-D30 and I did replace one of the caps, a .47u but the speed wobble and slowish problem persists. Do you think the other values, which a pair reads 3.3u, are critical? Because I...
  24. FB resistor swap for coil to just FB bass for speaker damping

    I guess you could call this the honey coil. It won't mess with your highs and still addresess the resonant frequency damping. So wondering what Henries to use, 1.2H? Can easily shield the coil but...
  25. I have some of those variations and don't mind...

    I have some of those variations and don't mind using more heater current and play little heed to melting a PT- as never have yet. I tend to play with the preamp on 10.
    Having to ability to switch...
  26. Cathode follower - lowering cathode resistor for 12dw7 or ecc823

    Have you experimented with the cathode follower resistor? I tend to think that encouraging the low Z aspects of this circuit might be good. Amps often insert an effects send on this too. I also...
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    Yes thanks I'm referring to the grid stopper. I...

    Yes thanks I'm referring to the grid stopper. I know higher values are common in preamps. There 47k would be pretty conservative. But on output tubes they seem to always really low: 1.5k, 4.7 k et...
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    6L6 to el34 conversion - grid resistors

    So far I've left the stock 47K Ω grid resistors in. The amp sounds killer and not too dark. Is it fine to just leave them in as is? It has a 12at7 in the PI and will henceforth.
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