Search:

Type: Posts; User: PRNDL; Keyword(s):

Page 1 of 13 1 2 3 4

Search: Search took 0.03 seconds.

  1. Replies
    6
    Views
    3,152

    Cleaning the contacts and re-seating the boards...

    Cleaning the contacts and re-seating the boards seems to have solved the popping noises, although that bracket seems like a great idea.

    The next issue is the variable power pot doesn't seem to do...
  2. Replies
    6
    Views
    3,152

    That bracket sounds great. Is it something easy...

    That bracket sounds great. Is it something easy to make?

    Thanks for the schematics!
  3. Replies
    6
    Views
    3,152

    Seymour Duncan Convertible with popping noise

    I have a Seymour Duncan 100W Convertible that has popping noises when played at moderate volume, but it's fine at low volume.

    Moving the modules seems to cause the same noises, and I'm wondering...
  4. Have you measured the bias of the output tubes?

    Have you measured the bias of the output tubes?
  5. Replies
    2
    Views
    2,021

    Master volume on a SE amp?

    I'm designing a single-ended amp with reverb and tremolo - it's based on the princeton reverb with a cathode follower before the tone stack.

    At present, there is a master volume before the output...
  6. Replies
    4
    Views
    1,643

    I'm wondering if adding a master volume before...

    I'm wondering if adding a master volume before the output tube is a good idea in a single-ended amp.

    Also, whether I it's advisable to switch to cathode bias.

    Any advice is welcome!!
  7. Replies
    4
    Views
    1,643

    Easy enough to add it. -- thanks

    Easy enough to add it. -- thanks
  8. Replies
    4
    Views
    1,643

    Is a cap needed between MV - SE with bias?

    I'm designing a single-ended amp with tremolo and variable bias. It's based on the princeton reverb circuit.

    I've added a master volume pot before the grid (pin 5) of the 6V6, which also has a...
  9. Replies
    4
    Views
    2,709

    Actually, the front panel is getting fairly...

    Actually, the front panel is getting fairly filled up with knobs, but a dwell does sound cool.

    I'm designing something based on the Princeton Reverb, but with middle tone, presence and master...
  10. Replies
    4
    Views
    2,709

    What's the best reverb tube/circuit?

    Most Fender amps use a 12AT7 wired in parallel for the reverb driver, but some of their modern custom shop amps use a 6V6 instead.

    Does anyone have an opinion as to which driver tube, or reverb...
  11. Replies
    13
    Views
    10,471

    Changes in the circuit design caused major...

    Changes in the circuit design caused major changes in lead dress.

    In pre-CBS amps, the wires had straight runs from the board to the tube socket pins, and few, if any, crossed over. Post-CBS amps,...
  12. Replies
    46
    Views
    4,866

    Last time I was at Larry Roger's shop he had a...

    Last time I was at Larry Roger's shop he had a beautiful Princeton Reverb that he had finished working on, and wanted me to listen to it.

    At first, I thought the punchy highs were painful, until I...
  13. Replies
    12
    Views
    3,166

    This is a somewhat complicated answer, and you...

    This is a somewhat complicated answer, and you may want to review some tube amp design sites.

    IIRC, the general idea for headroom is to design the amp so that the plate voltage of the tubes is...
  14. I've looked into the 12VDC tubes and the general...

    I've looked into the 12VDC tubes and the general consensus is they are not suitable for microphone preamps, although they do make a decent guitar amp.

    As to using a wall wart, the general issue...
  15. Replies
    1
    Views
    1,625

    Fixed a wiring mistake

    It turns out the owner swapped a ground wire with one of the LED driver wires, which was shorting 40 volts to ground.

    A simple fix.

    The original foot switch now works fine most of the time....
  16. Replies
    1
    Views
    1,625

    Randall RG100ESXP sparks and LEDs don't work

    This Randall RG100 has problems with the LEDs on both the front panel and in the foot switch. They would work sometimes if you jiggled the connector cord to the foot switch.

    It turns out to be a...
  17. Randall RG100 ES XP footswitch LED's don't work

    The LED lights don't work -- I think it needs a new drive transistor, or something.

    OK - the owner tried to re-solder the connector and made things a lot worse.
    It looks like he may have shorted...
  18. Replies
    0
    Views
    2,160

    the front angle of a Princeton Reverb Cabinet

    How do you get the front angle of a Princeton Reverb Cabinet just right?

    It appears to be a double angle - one for the speaker baffle, then another for the chassis.

    Thanks!!
  19. Replies
    8
    Views
    5,801

    I like that simple jig and craftsman jig saw!! ...

    I like that simple jig and craftsman jig saw!!

    I've been using a RotoZip that has a special attachment for cutting circles. It works pretty good, although it's slow going through plywood, since...
  20. Replies
    0
    Views
    1,371

    Cannon Audio SP65

    This is a cool amp.

    A schematic and layout would be greatly appreciated!
  21. Replies
    7
    Views
    41,094

    EL34/EL84 versus 6V6/6L6

    I'm interested in the tone differences between EL34/EL84 and 6V6/6L6 output tubes.

    Here's what I know so far. There are a lot of generalizations.

    Amps:
    6L6 - Fender Deluxe Reverb
    ...
  22. Replies
    10
    Views
    3,524

    Thanks --- you confirmed my suspicions - this is...

    Thanks --- you confirmed my suspicions - this is a crazy build!!

    Fortunately, the amp seems to be working well, although it's hard to be certain.

    The difficult issue is it has great tone and...
  23. Replies
    10
    Views
    3,524

    Peavey Delta Blues - Cap job and the PCB

    I'm hesitating on removing the PC board on a Peavey Delta Blues. The volume is fluctuating when played (new tubes, EH preamp and JJ power), which usually means it's time for a cap job.

    The...
  24. I'd begin by checking simple things like the...

    I'd begin by checking simple things like the speaker cord - it could be bad, or plugged into the wrong jack. On some amps, the external speaker jack should not be used for one speaker.

    Does the...
  25. I've been working on an old ADA Microtube 200 ---...

    I've been working on an old ADA Microtube 200 --- the switching power supply is kicking my tech butt (and spurring some old fashioned learning).

    In the last go around, the power MOSFETs seem to...
  26. Replies
    17
    Views
    4,699

    Fish paper is what they used in the old days to...

    Fish paper is what they used in the old days to make boards. It's for those that want to make a vintage-accurate build.
  27. Replies
    17
    Views
    4,699

    Here are some more links Inexpensive...

    Here are some more links

    Inexpensive transformers
    Home - A Thermionic Webplace

    Tools
    Harbor Freight Tools - Quality Tools at the Lowest Prices
    Wiha Professional Quality Tools Home Page
    ...
  28. Replies
    17
    Views
    4,699

    Does anyone have a source for inexpensive chassis...

    Does anyone have a source for inexpensive chassis material?

    Old posts mentioned using 'cased open' for fire doors, which is a C channel with returns that comes in 4.75, 5.75, 6.75, 7.75 and 8.75...
Results 1 to 28 of 337
Page 1 of 13 1 2 3 4