I have an SP6. Turn it on before the power amp and turn it off after shutting off the power amp. It remains an excellent preamp at an affordable price!
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Some of those transformers are hard to source. VTL service and support were horrible in my experience.... they hate servicing legacy products that are bought used. I learned the hard way with a used Compact 50 , which sounded great when it worked. Most unreliable, I should say ONLY unreliable component I’ve ever owned and I have owned many.
Harry, FYI the Compact 100 and 80 amplifiers were VTL products. That has been a separate company from Manley for many years now. I'd suggest contacting VTL for information about any differences between the amps. I've owned both VTL and Manley amps and found factory service to very good.
The simple basic rule with separate components - turn amps on last and off first. That way any pops or surge from other components won't be amplified if the amps are already on.
Thanks, pryso. I realized my naming error after posting. Manley and VTL were so intertwined in the early days that I simply slipped up. As for sequence, I know you are correct, and I managed my D90 okay. But I am getting quite old, and am not as reliable as I used to be. I was hoping maybe the m80 is the m100 with the bias-rail problem fixed (Stereophile said that to do so would lower the power output level, hence the "80" vs the "100".
Thanks for your comment.