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RE: Question about recapping a Dynaco ST70

Just as important as getting the caps. right is dealing with the TOTALLY inadequate OEM C354 choke. "Shoehorn" a Hammond 159T in.

Personally, I'd use a 47 μF. 1st filter cap. and install a CL90 inrush current limiter between pin 8 of the rectifier socket and the PSU filter. I'd also install UF4007s in series with the 5AR4 plates, as has been documented repeatedly here on AA. "Fireworks" will not occur, even if a current production Sovtek 5AR4 is used.

Use a substantial amount of capacitance in the reservoir position. Hafler's reasons for the can he used were primarily monetary, not technical.


Eli D.


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  • RE: Question about recapping a Dynaco ST70 - Eli Duttman 19:15:34 07/10/14 (0)

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