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  1. I'm glad you were able to get it all sorted out!...

    I'm glad you were able to get it all sorted out! I just saw your messages today, so I'm happy I don't have to go look for the schematic. :)

    I've got one of these that is completely stock and...
  2. As Enzo said, these amps are non-adjustable fixed...

    As Enzo said, these amps are non-adjustable fixed bias. There is an error on the commonly available 1484 original schematic. Actually two errors. The first is that they show the grid resistors of the...
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    Does it still have the "Planet" brand filter caps...

    Does it still have the "Planet" brand filter caps in it? How about he can cap? Doe sit look original, or at least is it a 20-10-5 can cap? If so those are original and should be replaced. Regardless...
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    That is how the standby is on these amps. They...

    That is how the standby is on these amps. They short the power tube grids together, but it is imperfect, so there is a bit of leakage. I consider it part of the charm of these amps.

    Greg
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    Atoms are definitely not the best caps out there....

    Atoms are definitely not the best caps out there. They are some of the most expensive, but use old technology and a much larger case size than what is necessary. A guy on Hoffman's site took one...
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    They used shoddy parts in some cases, such as the...

    They used shoddy parts in some cases, such as the material the boards are made out of which can break easily if bent at all; the resistors aren't very good quality and drift more than most; the...
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    Nice score! They are a pain to work on but sound...

    Nice score! They are a pain to work on but sound great. I wrote up some stuff on working on one of those with many possible mods here at Ampage and I think at Hoffman's site too. You can search me on...
  8. I used to have a 200S head and cabinet and sold...

    I used to have a 200S head and cabinet and sold it to get an SVT head. It was a particularly awesome sounding and original 200S too...early Dynaco transformer in a one chassis head rather than the...
  9. https://el34world.com/charts/Schematics/files/Sunn...

    https://el34world.com/charts/Schematics/files/Sunn/Sunn_sceptre.pdf

    They're using transistors for the trem and reverb.

    Personally I can't stand Sunn amps for guitar...hard and not very touch...
  10. You will find that your soldering will be 100%...

    You will find that your soldering will be 100% better with a temperature controlled soldering station rather than the 40 watt iron or 60 watt iron or whatever. Leaded solder is also much easier to...
  11. That is completely correct. Its not ideal, but to...

    That is completely correct. Its not ideal, but to make one that switches inputs and outputs at the same time is a lot more complicated. The three head version I have I got for a specific purpose. I...
  12. Ted Weber has made one of these for years. ...

    Ted Weber has made one of these for years.

    https://www.tedweber.com/two-head-fs

    I've got a three head version that Ted made right before he passed. They discontinued that, but borrowed it from...
  13. If you're looking for sag but don't mind the use...

    If you're looking for sag but don't mind the use of solid state diodes, and don't want to use series resistance to get the sag, you can also consider the use of a voltage doubler. A benefit to that...
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    Depending on the vintage of B15N, the first cap...

    Depending on the vintage of B15N, the first cap after the rectifier is a 30uF. Then there is a 1k 10W, and then the 40uF sections of the can cap. I have a 1967 B15N on my bench right now. Someone had...
  15. Looking forward to hearing it and seeing pics! ...

    Looking forward to hearing it and seeing pics!

    You should try a PTP amp at some point. Draw it up on paper first and it will make more sense. Once you've done it, then it is easy to do more. The...
  16. If it was me I'd build the amp as original as...

    If it was me I'd build the amp as original as possible, then once it works, tweak from there. The originals sound great and don't hum overly much. I've even used one in the studio for bass as it was...
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    I haven't worked on the Silvertone 1333...

    I haven't worked on the Silvertone 1333 specifically but have worked on a lot of 1484/1485's and other vintage amps. I'm a EE also, and am in Oregon also, though I'm in the Portland Oregon metro...
  18. Yeah just call them. If you give them the...

    Yeah just call them. If you give them the transformer number they will have records for it and can build it for you. They originally cloned that transformer for the customer that I had who had three...
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    Go to this website. I recall a thread there...

    Go to this website. I recall a thread there probably from 8-10 years ago in the bass section about recharging those. Might be some info in the pickup section too.

    Greg
    ...
  20. Another thing to keep in mind is that if you have...

    Another thing to keep in mind is that if you have a 350V power transformer like you suggested above, with a solid state bridge rectifier that will be 490V with no load. When you put a load on it then...
  21. Yeah I started with that too, but then gutted it...

    Yeah I started with that too, but then gutted it to start over. Ideally I would have moved the transformers away from each other a bit. They are both "Z" mounted, and since they are so close I...
  22. I gutted mine and started over with my own...

    I gutted mine and started over with my own circuit. The transformers are too close together with the same orientation on the stock chassis, so if you turn the gain up then it will hum more than it...
  23. I did a whole bunch of modding and work to a CHB...

    I did a whole bunch of modding and work to a CHB 100. I have a second one here to duplicate what I did on the first one. They're pretty cool amps, though the chassis layout is poor, especially where...
  24. I would just duplicate the parts that they used...

    I would just duplicate the parts that they used if you want that sound. A large part of the sound of those amps is the unbalanced paraphase inverter, but even something as simple as using ceramic...
  25. You're welcome! Greg

    You're welcome!

    Greg
  26. I had what I thought was ghost notes due to...

    I had what I thought was ghost notes due to oscillation or bad filter caps, or undersized filter caps on my 1993 Korg AC30 since new, and it was actually cone cry from the Celestion Blue speakers....
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    And some more info here. ...

    And some more info here.

    https://en.wikipedia.org/wiki/6L6

    Greg
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    I believe that GEC invented the kinkless tetrodes...

    I believe that GEC invented the kinkless tetrodes to get around a Phillips patent on the pentode design, but they initially had trouble with it, so since they were affiliated with RCA in the uSA,...
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