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  1. Replies
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    149

    Exactly which model of twin reverb? With the...

    Exactly which model of twin reverb?
    With the classic type, the V3 cathode bypass cap is simple to lift one leg of; that will noticeably reduce the reverb drive level and also make the driver much...
  2. It's worth giving the OT a close examination,...

    It's worth giving the OT a close examination, there may be an unused 8 ohm wire or terminal available.
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    555

    Donít Hammond make a replacement PT for the RI?

    Donít Hammond make a replacement PT for the RI?
  4. Wow thatís cheap! The existing wiring should be...

    Wow thatís cheap!
    The existing wiring should be fine, just swap in another speaker. Careful when removing the female spade connectors, you donít want to force things and have them open up, thereby...
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    267

    I don't see any point in idling them any hotter...

    I don't see any point in idling them any hotter than any other 6L6 type tube in a BF type power amp, ie 30mA cathode current / 6L6. All such tubes have the same bogey characteristics.
    Why should...
  6. https://echa.europa.eu/substances-restricted-under...

    https://echa.europa.eu/substances-restricted-under-reach
    See cadmium sulphide
  7. Sticky: But unless youíve also got the spec for the stock...

    But unless youíve also got the spec for the stock OT, in regard of this issue, the spec of its replacement is of no benefit.
  8. Replies
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    888

    I've never tried one out, so thanks for the tip....

    I've never tried one out, so thanks for the tip. Any model you'd recommend? Do they create a notchy dead zone in the trem arm movement? I've been put off them by the fear that they will make subtle...
  9. Replies
    27
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    888

    There are some good tips on the Kinman site that...

    There are some good tips on the Kinman site that worked pretty well with my strat. The key for me was having less than 1 turn of the string on the tuning peg.
    ...
  10. Replies
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    Yes, thatís it. Regarding distortion pedals,...

    Yes, thatís it.
    Regarding distortion pedals, the electroharmonix soul food is cheap enough, maybe £40 secondhand, and can sound quite reasonable.
  11. Replies
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    Merlinís page on output stage design may help?...

    Merlinís page on output stage design may help? http://www.valvewizard.co.uk/se.html
  12. Replies
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    Fixed bias to the grid may work out simpler than...

    Fixed bias to the grid may work out simpler than faffing around with cathode resistor values :)
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    'Ripple noise' normally means HT ripple, eg 100Hz...

    'Ripple noise' normally means HT ripple, eg 100Hz hum (as I think you're in Europe); is that what you meant here?
  14. The topic of harmonic vib, and mention of Roly...

    The topic of harmonic vib, and mention of Roly Roper in a concurrent thread, reminds me to link to his very helpful explanation of the circuit on another forum...
  15. Thread: Bassbreaker 15

    by pdf64
    Replies
    5
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    171

    It seems weird that 39V 5W zeners on EL84...

    It seems weird that 39V 5W zeners on EL84 cathodes are failing :confused:
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    The way I see it, in regard of power tube...

    The way I see it, in regard of power tube characteristics, the screen grid IS the plate. For regular amps, the screen grid HT node is as stiff and ripple free as feasible, by use of a pi (ie CLC)...
  17. What were the plate, screen grid and cathode Vdc...

    What were the plate, screen grid and cathode Vdc before and after the change?
    It may just be that the screen grid voltage was increased significantly, resulting in the tube drawing more current,...
  18. Replies
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    Great idea :thumbsup:

    Great idea :thumbsup:
  19. Now that the plate dissipation is reasonable,...

    Now that the plate dissipation is reasonable, there's no reason not to use your 5E3, life's too short not to enjoy the fruits of your labours :)

    It may be that the JJ 5Y3 has the same...
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    Other reputable tube vendors may be able to sell...

    Other reputable tube vendors may be able to sell you tubes that bias up the same as whatever GT number you request - just ask them!
  21. 5AR4 is the North American name for the GZ34...

    5AR4 is the North American name for the GZ34 (european), the same tube can be called either.
    I suggest to look for a vintage, used but Ďtests goodí, warrantied 5Y3 on ebay etc.
    I guess that with...
  22. As mentioned previously, a 5Y3 of vintage...

    As mentioned previously, a 5Y3 of vintage manufacture should be used with 6V6; a 5R4 may be ok.
    Only use the GZ34 with 6L6 type power tubes. Otherwise the HT (and hence power tube dissipation) will...
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    It's a margin of stability thing, set by the...

    It's a margin of stability thing, set by the opamps gain/bandwidth/phase characteristics and the gain/bandwidth/phase of the circuit it's being used in (both the simple schematic design and its...
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    Great, pleased that worked out for you, now...

    Great, pleased that worked out for you, now that's proved the root cause, you may be able to bring R4 down to 2k2. I had to work that issue out for myself when I started tinkering with this stuff (40...
  25. Yes, otherwise the gain increase when open loop...

    Yes, otherwise the gain increase when open loop may be getting counteracted by the fall in input impedance (thanks to a midway setting of a 1M master vol).
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    Careful of robrob's site, excellent graphics but...

    Careful of robrob's site, excellent graphics but often technically some 'room for improvement' (kudos to him for all his work with it, it's easy to criticise). It's generally recommended that the...
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    At 1k, R4 might not be sufficient to prevent the...

    At 1k, R4 might not be sufficient to prevent the capacitive load of the cable causing instability; try 4k7.
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    Have you got the map for the Marantz PM-48 by any...

    Have you got the map for the Marantz PM-48 by any chance?
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