In Reply to: Did You Upgrade the Phono EQ for the Highs in the M65 ? posted by Interstage Tranny on September 15, 2010 at 15:28:18:
Hi, IT:
Much thanks for the lovely images and the very useful suggestions for upgrading the Shure Brothers M-65 two-tube phono preamplifier from the sixties.
The two examples I own were found over several years in local flea markets and I really had no idea just how good they were until I lent one to a friend ofmine one day and he was quite impressed with it.
I only replaced the coupling caps in them, but noticed that in one unit, there was some low-level hum most likely coming from the two sectional electrolytic. I was going to consider re-stuffing it, but I see that you managed to squeeze in some replacements under-chassis, which I much prefer doing.
Incidentally, I do not know what brand of tubes you selected for your units, but the smooth-plate Telefunkens which came in mine were hardly ever used and tested very well, so I left them in. I also tried some NOS Amperex 12AX7As and they just did not do it for me. I concluded that the units were somewhat fussy about which tubes you put in them, including some Mullards I had around. The Mullards worked nicely, but to me, the Teles were the trick, and some old Tungsrams were not that great sounding in the same circuit, that is.
I saw that some of thse M-65s were offered on eBay recently and that is interesting, considering that this unit was such a sleeper and got little or no attention several years after its introduction.
Tell me a little about the Japanese unit, however!
Intersting to see such an apparent knock-off. Is the circuit identical?
If so, Shure Brothers might be interested in knowing about that, but then again, these things are so old by today's standards, yet they work so splendidly.
Thanks again!
Richard Links
Berkeley, CA
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Follow Ups
- RE: Did You Upgrade the Phono EQ for the Highs in the M65 ? - Marantzguy 09/15/1017:11:19 09/15/10 (5)
- the Shure M65 vs. chrome phono preamps... - Interstage Tranny 17:48:48 09/15/10 (4)
- I'm using a chrome phono stage - HI FI BOB 07:00:00 09/18/10 (2)
- Maybe, I can help you like it even more... - Interstage Tranny 13:45:05 09/18/10 (1)
- RE: Maybe, I can help you like it even more... - HI FI BOB 10:55:03 09/19/10 (0)
- RE: the Shure M65 vs. chrome phono preamps... - Marantzguy 10:24:32 09/16/10 (0)