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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Dynaco mkIII, which source for upgrades or rebuild parts? posted by chris on September 28, 2004 at 14:36:51:
Hi,I still have my MKIII's I acquired in the late 70's. They did a credible job driving a pair of Acoustat electrostatic panels.
I completely morphed mine into something different , and you can get carried away on theses things, regulation of the B+ and bias..solid state rectification with computer grade caps, bias level and balance controls , teflon sockets etc..so mine is not a MKIII anymore.
The problem with the MKIII is the underated can cap..for the power supply. They tend to fail. Replacements are available from AES ( reliability issues on these?) and maybe Vibroworld can make something up...otherwise you're into a curcio or Triode electronics board for the capacitor bank. The choke is not usually a problem...but tube sockets can cause you all sorts of grief in biasing..I'd change them all. Virtues of the new board topologies can be debated but there is someone who sells new boards in the original circuit configuration...maybe someone can chime in with his website or you can try a search for dynaco boards. Bias components should be changed and input sockets as you mentioned. So I'd keep it "stock" and move forward slowly on all the upgrades.
That all said I never thought the MKIII's ever had the magic of a ST70. Mine have been sitting on the shelf for maybe 20yrs! However, to buy an equivalent type mono tube amp today with probably inferior iron would probably cost you $3-4K a pair....so they are still worth the effort in restoration.
Good luck ,
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Follow Ups
- Re: Dynaco mkIII, which source for upgrades or rebuild parts? - AJ 18:06:53 09/28/04 (0)
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