Re: Unusual TM5xx(x) MF - its not a TM500 or a TM5000


I wonder if that is different than the A series?
I have a TM504A. AFAIK the 504A is a 504 beefed up (bigger caps and pass transistors) and fan specifically designed for the audio distortion analyzer and signal generator plug ins. It has a fan but does not have the lower venting.of the TM5000x series. It also does not have GPIB as the OP mentioned. It is not a 5000x series but a 500 series main frame. It does look more modern than a TM504 but not as modern as a 5000 series or as tall.

The funny thing about the TM504A is, although it was designed for Audio plug ins, the fan is so crazy noisy I can't stand to use it. I did replace it with a lower noise fan, with the same air flow, but it is still really noisy and I can't stand to use it unless I have to due to this.

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