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  1. Replies
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    Hi Guys As others point out, the bare Ground...

    Hi Guys

    As others point out, the bare Ground wire is tied to Neutral at the fuse/breaker panel. If your outside plug has a broken ground then you need to either run a new wire or find where it is...
  2. Hi Guys The 12Vdc will be floating and NOT...

    Hi Guys

    The 12Vdc will be floating and NOT tied to ground at either end. For an internal switching system this is no problem, but if you want to have a remote footswitch, you have to consider that...
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    Hi Guys Yes, you can switch the plate resistor...

    Hi Guys

    Yes, you can switch the plate resistor value and several amp builders have done this.

    There are two common approaches: The first places two Rs in series and one R is simply bypassed...
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    Hi Guys Obviously the OP was referring to a...

    Hi Guys

    Obviously the OP was referring to a matched set of tubes, which are of some nominal use when there is no means to hum-balance the output stage using bias pots. Ideally, there are cathode...
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    Hi Guys A 1M to ground to damp transients also...

    Hi Guys

    A 1M to ground to damp transients also throws away 10% of the gain. 10M will do the same for transients but not reduce gain.

    If you use good quality switches like the C&K 7000-series,...
  6. Hi Guys I never use MOVs nor buy any of those...

    Hi Guys

    I never use MOVs nor buy any of those "spike protector power bars" that have them because MOVs degrade as they absorb energy, and their ultimate point of zero-protection is unknown. The...
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    Hi Guys I've had more than one tech relay the...

    Hi Guys

    I've had more than one tech relay the same info regarding bypassing the EPA and having a more traditional tone from the YJ and AFD. The reason is obvious if you know how the circuits work...
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    Hi Guys TUT4 and TUT6 shows hundreds of...

    Hi Guys

    TUT4 and TUT6 shows hundreds of circuits that can be used to Power Scale an amp, and the bulk of these use small noncritical pots with little voltage across them. SSH describes the methods...
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    Hi Guys The 100k in series with the zeners is...

    Hi Guys

    The 100k in series with the zeners is not required and does not contribute to protection. It's good to do this in signal clamping circuits to give compliance and a rounded clamp action...
  10. Hi Guys The 600V choke is fine at 575V. Just...

    Hi Guys

    The 600V choke is fine at 575V. Just like a filter cap, this is working voltage.

    Have fun
  11. Replies
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    Hi Guys You haven't noted the signal levels...

    Hi Guys

    You haven't noted the signal levels through the circuit although there are some DC voltages that help. It would look like the splitter only has to provide a 12V signal, but maybe it's...
  12. Hi Guys An EF-86 is a bi extreme and you...

    Hi Guys

    An EF-86 is a bi extreme and you wouldn't get much output.

    Have fun
  13. Hi Guys One-tube reverb loops are always a...

    Hi Guys

    One-tube reverb loops are always a compromise and never sound that good, but.. it depends on how much you really care about reverb. For me, I would give up distortion before I gave up...
  14. Hi Guys The self-split output stage can be...

    Hi Guys

    The self-split output stage can be built using any tube type or combination of tubes. The key to its operation is the shared cathode resistor which is UNBYPASSED. This assures dynamic...
  15. Hi Guys The paraphase should have a warmer...

    Hi Guys

    The paraphase should have a warmer tone all the way around. This is because the signal to one output side passes through an extra gain stage and will behave that extra veil of tube...
  16. Hi Guys Make sure the ground you are using as...

    Hi Guys

    Make sure the ground you are using as a reference really is ground and that the circuit shares that reference.

    Have fun
  17. Hi Guys Just as a point of interest,...

    Hi Guys

    Just as a point of interest, self-split output stages can be built using regular power tubes as well.

    With the right speaker cabinet or two, a 1W amp can easily be too loud.

    Have fun
  18. Replies
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    Hi Guys Look at the schematic for the old...

    Hi Guys

    Look at the schematic for the old Traynor and you see it is essentially the same as a plexi. All you have to do is look inside the amp to see how the layout works and go from there. It's...
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    Hi Guys Hammond states explicitly that the...

    Hi Guys

    Hammond states explicitly that the "Classic" series PTs can be used with a bridge over the CT and one end, the other end taped and stowed, and the PT will operate cooler than with the...
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    Hi Guys catalin: You do not need the...

    Hi Guys

    catalin: You do not need the choke-filtered supply for the driver and preamp provided there is sufficient RC stages.This is more typically fed from the screen node, which is often choke...
  21. Hi nsub With the chassis punching already done...

    Hi nsub

    With the chassis punching already done determining which end the mains wiring will be on, it would have been sensible to just build the circuit in the order already dictated, placing the...
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    Hi Guys pd64: The blocking distortion et al...

    Hi Guys

    pd64: The blocking distortion et al that you refer to in a Fender amp is to be expected. There is no voicing accommodation for being overdriven since Fenders were designed to be used...
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    Hi Guys The standard self-biased concertina...

    Hi Guys

    The standard self-biased concertina can drive full output stages - why shouldn't it? The schematics of the amps above do this, as do all the Dynaco amps with KT-88s and typical c500V...
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    Hi Guys pdf64: You may not be sure of the...

    Hi Guys

    pdf64: You may not be sure of the above but I am and have been for decades. I made the changes and trials in hardware and players and other techs agree with the facts above since they...
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    Hi Guys Thanks for the link! In this amp,...

    Hi Guys

    Thanks for the link!

    In this amp, each input stage plus its level control are treated as a "block". A relay places them in series or parallel, the latter being the stock "plexi" format....
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    Hi Guys The 15% target is a good one yet most...

    Hi Guys

    The 15% target is a good one yet most amps never attain it.20% is even better and will definitely turn off all samples of tube inserted unless the tube is defective.

    Higher screen-stops...
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    Hi Guys Bias voltage is not what matters,...

    Hi Guys

    Bias voltage is not what matters, rather it is idle current and idle dissipation. The value for your amp depends on the plate voltage and the dissipation rating of the tubes.

    KT-88s...
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    Hi Guys Loudthud: Do you have that schematic...

    Hi Guys

    Loudthud: Do you have that schematic for the "new" YBA1? Can't find it on Yorkville's site nor the Traynor site.

    You can link the inputs internally using the closed contacts on the...
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