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For ST70 tweakers only: some questions for you...

Hi there!

My ST70 is now being shipped to me and I'm excited. Although this is not my only tube amp, this is my first vintage amp. I'm looking forward to getting the ST70 and really playing around with it!

Okay, I've spent some time reading the archives and visited some ST70 sites, but I still have some questions:

1. Triode mod: Do you recommended doing this on the ST70? I have fairly efficient speakers so the reduced power is not an issue. Other than the resistor installation/etc., are there other things I need to do elsewhere in the amp. I'm also thinking about installing a switch so I can go back to penthode mode. From your experience, what improvements did you get with the ST70 in triode mode?

2. PSU filter caps: Unit has new quad caps, but I've read adding more capacitance would help. What values/brand and where (after choke?) to install.

3. Would a high/low pass filter installed at the input actually help (AVA mod)? Was worried because this adds 4 more components/channel along the signal path!

4. Coupling caps: would a higher value (from 0.1uf) coupling cap improve anything? I've read mods that replace this up to 1.0uf. What value do you use and any recommended brands?

5. Amps comes with a NOS 5AR4...what other (spare) tubes should I try?

6. Lastly, what preamps do you use with your ST70? I'm thinking of the Foreplay/Anticipation or the DIY VTV Octal linestage...quite affordable and good sounding.

Cheers,

Francis



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Topic - For ST70 tweakers only: some questions for you... - Francis S 21:00:01 06/8/00 (5)


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