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  1. Marshall, what were you thinking shiipping a transformer like this???

    It's probably a good thing my boss he wanted to deal with Marshall, and didn't let me call Marshall service today after receiving this transformer.
    Some brief context... I customer bought a used...
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    Indeed :thumbsup:

    Indeed :thumbsup:
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    I suppose. But it serves as the negative voltage...

    I suppose. But it serves as the negative voltage reference point in the same way any cathode biased common cathode stage does where the grid leak is tied to ground. This was the only comparison I was...
  4. I used to live in Dallas (briefly), on Swiss Ave....

    I used to live in Dallas (briefly), on Swiss Ave. If I ever find my way down ther again (It'll probably be on my way to Austin) I'd definitely be interested in checking out your amps/shop. I'm...
  5. Chuck, youíre my EL84 brother here at the forum....

    Chuck, youíre my EL84 brother here at the forum. While Iíve only ever heard clips of Trainwrecks, the trainwreck liverpool is the best sounding amp Ive ever heard. Definitely an inspiration for me to...
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    I, for one, hope Fender never stops making their...

    I, for one, hope Fender never stops making their Blues/Hotrod amps.
    Some brilliant member here said ĎThe Fender Hotrod series is to amp techs what Microsoft Windows is to IT guys, a reliable and...
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    Fortunately the most of the ones in I have (some...

    Fortunately the most of the ones in I have (some in that photo) have nice heavier gauge leads than some of the other common polystyrene types. I wanna say, like, 20AWG or there abouts

    Edit: just...
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    I can almost justify NOS preamp tubes in that,...

    I can almost justify NOS preamp tubes in that, they have the potential to last for years and years. Having said that, Iíve had so many of my own vintage tubes, ones that sounded great, end up going...
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    Wait, didn’t we have to effectively short the...

    Wait, didn’t we have to effectively short the grid to the “ground” point at the top of the bootstrap resistor to bootstrap the cathode? In a normal cathode biased cathode follower, where the grid is...
  10. After shorting the large grid stoppers, the first...

    After shorting the large grid stoppers, the first breakpoint in the open loop response moved up to around 15kHz with a shift in 45deg.

    My next question is: Now what? do I close the loop and...
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    I only dig this thread up because I had a...

    I only dig this thread up because I had a question about identifying voltage rating. I have some ranging from 100pF-1000pF.

    55180

    Helmholtz, do you know if the markings hold true across all...
  12. I’ll have to double check, but I believe the...

    I’ll have to double check, but I believe the early ones had 47k ( or similarity large) grid stoppers as well.
  13. Both the nylon washers and bolts, and potting...

    Both the nylon washers and bolts, and potting sound viable. If I decide to pot the, I have some small steel powr Transformer covers I could use.
    On the other hand, the copper temp in these coils...
  14. The problem is, 1mA across 47k would cause a...

    The problem is, 1mA across 47k would cause a voltage drop of 47 volts. I don’t see how the grids could be driven into positive grid voltage
  15. Is can’t operate in AB2 due to the cllamping...

    Is can’t operate in AB2 due to the cllamping action caused by the 47k grid stoppers. My guess is the direct coupling is to eliminate the RC HPF, and preventing blocking/crossover at low frequencies.
  16. What do people use to physically mount these...

    What do people use to physically mount these things?
  17. Do you think it would be better to mount them...

    Do you think it would be better to mount them with internal screening (inside the enclosure), so not to radiate into any drive circuitry I may include?
  18. Thanks. I hadn’t considered those factors. I was...

    Thanks. I hadn’t considered those factors.
    I was thinking about aluminum for the heat dissipation and weight. I suppose I could just use a steel chassis.
    Initially i was going to mount them (air...
  19. So, I just got the main reactive components to...

    So, I just got the main reactive components to build this proper.

    54967

    For the main dissipation resistor(s), I have 55Ω/50W resistors I can run 10 in parallel. Or, I can buy a 1 or 2 higher...
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    :) yeah? okay. Well in that case I'm with...

    :) yeah? okay.

    Well in that case I'm with xtian on this one and would replace them, or check/reflow the solder joints under the board. Often this can crack and leave the leads floating in the...
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    I have no idea what picture youíre talking about...

    I have no idea what picture youíre talking about but I can almost guarantee what youíre hearing is the ceramic caps that bypass the diodes. Everyone of these does that to some degree. Itís not a...
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    I can dig that.

    I can dig that.
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    Oh, dude. The drill press is really nice (Jet)....

    Oh, dude. The drill press is really nice (Jet). Picked it up second hand in great shape. I've got a set of precision bearings lined up for the next real maintenance cleaning and teardown. I'm looking...
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    Yeah, instead of a grounded plate input stage....

    Yeah, instead of a grounded plate input stage. For instance... if you are mixing two out of phase signals -- one feeding the inverting input (grid), and the other feeding the non-inverting input...
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    I'm glad you asked. The 6C67 is the tooth fairy's...

    I'm glad you asked. The 6C67 is the tooth fairy's favorite tube, in that it doesn't exist.
    I'm sorry, that should be 6CG7. Of course, I was going to tell you that a 6CG7 has very similar...
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    Ah Ha! I was just testing you to see if you were...

    Ah Ha! I was just testing you to see if you were still payin' attention.... you passed. No, you're totally right. I just did the math and completely dropped out a decimal point or something.
    That's...
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    I'm kidding. With the circuit connected as...

    I'm kidding.

    With the circuit connected as drawn above, the B+ where I tapped the supply of my amp dropped under load down to about +215V (which is a little closer to 200V I originally designed...
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    okay. the results are in. stay tuned to find out...

    okay. the results are in. stay tuned to find out later on this week.......
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