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Old 24th Oct 2017, 8:41 am   #9
TIMTAPE
Octode
 
Join Date: Jul 2006
Location: Perth, Western Australia
Posts: 1,965
Default Re: REVOX A700 Transport Control and Capstanboard: Underdesigned transistors?

Yes but to me it still doesnt explain why in the A700 they used the TBA 931 which is demonstrably noisier than the cheaper A77/B77 model designs, and when for the later B77/PR99's they stayed with the standard discrete circuit. As mentioned the only reason I can think of is that there wasnt enough room in the A700's metal box to fit a discrete circuit.

Does anyone know why the 931 would be less vulnerable to magnetising the repro head due to the different rail voltage decays? Is there a modern 8 pin IC that would have this characteristic as well, while also having lower noise?
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