[Jukebox-list] Wurlitzer 2600 Sound issues

[Jens Hultgren]

Same phenomenon on both channels? On a stereo amp, you can move the tubes
around and see if some are bad.
The 6973 are taller than the substitutes 6CZ5/6CM6/6EM5 etc and can handle
more power. The substitutes will "fart" if you drive them too hard.
It does sound like your old preamp tubes are weak.

  Jens

On 8/27/07, Iain Jamieson <pinballrepair at paradise.net.nz> wrote:
>
> Hi,
>
> I have a 2600 (543Amp) that has been giving some sound problems. A new Cap
> kit and Tube kit were installed along with new sockets under all of the
> tubes as they were all extremely loose. The amp is now working through both
> channels as previously it was not, so that's a good thing.
> However, The following problems exist.
> If the new preamp tubes are installed, the audio has muffled bass and
> sometimes makes a farting noise that only goes away once the mech is in the
> rest position, the audio gain is noticeably higher with these tubes in. With
> the old preamp tubes installed, the sound quality is quite nice, but a
> squeal comes in after about 8 minutes of playing and the pitch gets higher.
> the power amp tubes in the kit were 6EM5's as an alternative to the 6973's.
> Anyone have any suggestions?
>
> Thanks  Iain.
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