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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: 6bq5 or el84(m)/6pi? posted by fstein on September 27, 2014 at 13:57:20:
I've been using a Maggie EL84pp for the last 7 years. Driving Spendor 9/1's I have flat response down to below 30Hz (according to both my ears and my test equipment.) This is not dependent on output tubes - I use vintage Sylvanias now, but had the same results with new Shuguangs, NOS Philips, etc. I too suspect weak components elsewhere in the amp; I replaced all the coupling caps with Jensen PIO's, installed new resistors, got rid of the balance control, and beefed up the cheesy power supply (larger choke and caps.) Another tip: wire the unused 6V secondary in series with the primary to compensate for today's higher line voltage (otherwise the EL84's run too hot.) It's also useful to replace the 10K resistor in the driver supply with 22K. This will bring the B+ to the drivers back to spec since you're not feeding the original preamp/tuner with it.
FWIW I have about 4 years on the Sylvanias and they show no signs of slowing down! Bottom line: when I find a better-sounding amp under $4000 I'll buy it. So far no luck! What you have is a diamond in the rough.
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- RE: 6bq5 or el84(m)/6pi? - dcharvonia 08:42:10 09/28/14 (0)
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