Tubes Asylum

Tube testing

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In Reply to: Re: 7308 replacements and recitifier question posted by Jim Carlon on September 27, 2002 at 12:03:20:

It's hard to find a place to test tubes these days. The dynamics are getting a little flat lately. Maybe I'll get a new tube anyway. Ya know this one is going to go sooner or later anyway. I'll look into what the going prices are for, RCA, bugleboy or mullard. I think I did see a Siemans on Upscale audio.
Is there a difference with large/big bottle vs the standard RCA type I already have?
Charles

Follow Ups:

Re: Tube testing - Jim Carlon 14:11:41 09/27/02 (0)
Don't rule out the ElectroHarmonix 5AR4 as an inexpensive new production unit. Once again, a good guitar shop should stock these, and it will certainly tell you whether or not you need to find NOS right away, or if you can hold out for a good deal.
Best,
Jim
Change the tube and see or buy a tube tester nt - Norm 13:05:01 09/27/02 (0)
a
Re: Go for it - navman 12:28:03 09/27/02 (3)
I was hesitant to repllace the rectifier, but the change does make a difference, not huge but worth it.
- Sag... - steven oda 13:19:57 09/27/02 (2)
  Charles,
  A tired rectifier starts to sag too early. Sometimes, guys think the power tubes are tired, as the tone with a tired rectifier is similar. Weak transients, early onset of distortion, flabby bass, odd overtones in midrange and high when the unit is pushed.
  As stated by the others, best to try a new replacement unit---and I like using new rectifiers on healthy power tubes, as the new rectifier can push a marginal power tube over the edge.
  - Descriptions of GZ-34 any recommendations for the ST-70 - airtime 14:30:30 09/27/02 (1)
    This is from upscale audio:
    ""5AR4/GZ34 -says made in Great Britain, but Japanese made, based on Mullard design. Super quality. Branded GE,
    Raytheon, RCA, etc $45 each
    5AR4/GZ34 - Mullard made in England, branded RCA, GE, Dumont, etc. We have a super stock of perfect ones! The most
    famous 5AR4 ever. Call for price.
    5AR4/GZ34 - Sylvania large bottle U.S. made excellent quality in white box. $out each ""
    This is from Triode:
    USA Made Philips
    large bulb 5AR4/GZ34.
    These are unmarked &
    in white boxes but we
    guarantee that they're
    the genuine item. Note
    that they're slightly
    larger (1 1/2"
    [38mm]wide by about
    3 1/4" [82mm] tall) so
    check clearance on
    your amp before
    ordering.
    - Re: Descriptions of GZ-34 any recommendations for the ST-70 - Micron 18:13:06 09/27/02 (0)
      Hi,
      Have you thought of using :-
      GZ34 Mullard doulble d-getters made in Holland or
      GZ34 Valvo doulble d-getters made in Holland or
      GZ34 Philips/Miniwatt doulble d-getters metal base made in Holland
      SO airframe there are plenty of Tubes NOS out there is the world you just need to know where to look, and they are not tired out
      ones. But real NOS/NIB types.
      Nicolas

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