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  1. for what kind of amp? a not that loud clean-ish...

    for what kind of amp? a not that loud clean-ish amp?

    just asking because it seems like high gain amps and also some loud basss amps a lot of the time tend to have 100uf screen node capacitance or...
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    I appreciate the replies and sorry I have not...

    I appreciate the replies and sorry I have not replied yet but I am still messing around with all this.

    Mozz, my cathode cap for V1 is .6uF so it's already pretty smalll. I guess I could reduce it...
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    There's an awesome thing he says where it's...

    There's an awesome thing he says where it's something along the lines of, "most people dislike doing the metalworking or chassis fabrication aspect of an amp build. However, the real reason most...
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    Metalworking for Poets oh yeah My favorite...

    Metalworking for Poets

    oh yeah

    My favorite is how he talks about doing chassis and headcase design with the idea of creating a convection current in mind so warm air dissipates from the amp...
  5. Are all the grounds wired identically the same in...

    Are all the grounds wired identically the same in both amps?

    What about if the heater winding is not balanced on one PT compared to the other. a hum balance pot or just artificial center tap for...
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    Check out pages 5-13 of this preview :) ...

    Check out pages 5-13 of this preview :)

    https://books.google.com/books?id=MwAVAgAAQBAJ&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false
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    Continuing to mess around with all this choke and...

    Continuing to mess around with all this choke and power supply variations for the high voltage 580V version. Using a choke for the preamp power supply nodes did tighten up the sound but it added too...
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    Well, there is another tidbit. He did say that he...

    Well, there is another tidbit. He did say that he thought hte amp was cutting out, but then realized it was the orange cab that was cutting out. I take that to mean that it actually wasn't "cutting...
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    could this also be stated as higher than nominal...

    could this also be stated as higher than nominal (ideal?) OT primary impedance increases screen current and dissipation and lower than nominal OT primary impedance increases plate dissipation but...
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    So if the amp is set to 8 ohms and the cab is 16...

    So if the amp is set to 8 ohms and the cab is 16 ohms then there would be higher screen current.

    But I doubt (just guessing) higher than average screen current could heat the tube to the point...
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    Just curious, but why would EL34 have 220K but...

    Just curious, but why would EL34 have 220K but 6550 have 150K grid leak? Is it because of pk-pk signal voltage needed to drive either tube to full volume?
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    Impedance mismatch

    I have a scenario where 2 of 4 power tubes have a blackened logo. As if either two power tubes lost bias, or one tube had a runaway bias condition and redplated then failed, then possibly the other...
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    Here's my silly logic. For my own stuff I...

    Here's my silly logic. For my own stuff I typically use United Chemicon or Panasonic (21st century modern industry standards ?)

    For repairs I used to use F&T's old fashioned-style big bulky...
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    I'm surprisd to hear this. I send back a quad or...

    I'm surprisd to hear this. I send back a quad or pair of tubes once or twice per year. I don't know how many pairs or quads or sextets I buy per year. Many dozens, probably not over 100 though. ....
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    Recently I observed screen grids to see if they...

    Recently I observed screen grids to see if they glow when amp is cranked. An amp I have has some screen grid glow so I wanted to see if it's normal. It has "conservative" 460v B+, 3H 80 ohm choke,...
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    If you are measuring cathode current then you are...

    If you are measuring cathode current then you are measuring plate current and screen current

    If you are measuring plate current, well then you are just measuring plate current.

    6.6W screen...
  17. Sometimes Arlyn is slow to reply. If they still...

    Sometimes Arlyn is slow to reply. If they still don't reply after a few days, if you call I'm sure they can help. THey will make pretty much whatever you want as far as I know.
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    If you really want any don't let the fine print...

    If you really want any don't let the fine print deter you from asking. I think that is just said as a necessity since they are technically not supposed to sell to the public at prices that beat...
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    Well, just guessing but I think to get that...

    Well, just guessing but I think to get that transformer at that price you would have to open an account with them and do a minimum order of 24 pieces (or was it 18?)

    It is the same OT as this but...
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    It took almost two years for them to sellout of...

    It took almost two years for them to sellout of NOS17482 the 100w "marahall" OT . they had 116 or so. I got about 12 thankfully. I wish I would have gotten more. I just shot out that transformer vs...
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    I don't understand how anyone could be talking...

    I don't understand how anyone could be talking about how great their "Marshall sound" is if they are using any Marshall made after about 1988 or so (were the 800s the last good ones or the silver...
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    Who makes them? Thanks but it seems like these...

    Who makes them?

    Thanks but it seems like these tubes are from the 1940s and 1950s. I would not add an obsolete old tube to a new product design. Also it seems like I would need 3 to deal with my...
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    Also, I have done same as Randall and people have...

    Also, I have done same as Randall and people have my personal phone number. I really regret doing that. You get people calling you at 8AM or texting you at 2AM, or any other hour of the day.

    a...
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    I agree the people who like to complain are more...

    I agree the people who like to complain are more likely to speak out.

    However, 1 good job and they tell their 10 friends you are awesome so the referral game comes in big too for spreading the...
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    Choke experiment

    I've built an amp that is pretty high voltage to try to get a lot of power so the PS has to branch off in some ways to deal with the high voltage. I do not use a choke and instead use a 1K 20W screen...
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    If 1 weirdo says you are a jerk and 100 other...

    If 1 weirdo says you are a jerk and 100 other people thought you were helpful and fair, I bet you will still be in good standing around town.

    I try to look at it this way, to me having a normal...
  27. I would guess the Panasonic caps are superior to...

    I would guess the Panasonic caps are superior to the F&T caps if they are 105 degree rated at 10,000 hour lifetime.

    On the question of whether any people use these in guitar amps, yes. I think...
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    I really appreciate all the replies. As I would...

    I really appreciate all the replies. As I would have expected, my knowledge on this subject and scenario has increased tremendously. Now I know just what to do. Thank you!

    ALso, the switch is...
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