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Old 16th Jan 2008, 6:27 pm   #1
mastermanx2001
Retired Dormant Member
 
Join Date: Jun 2007
Location: London, UK.
Posts: 366
Default Quad 2 Valve power amp questions

I have just brought my Quad 2 valve power amps back to life the first time in about 25 years. (see earlier thread today). They do sound fantastic at the moment through some vintage B&W DM4 loudspeakers. The amps have original line up of valves, which includes GEC KT66s. I understand that it is normal for the mains transformers to run quite hot. Mine run at 39 deg. C. However, I may wish to try and reduce this temperature, so as to make the amplifier more reliable by putting less strain on the mains transformer. This may be by using an output valve that draws less heater current. Out on the web there seems to be contradictions about heater currents for the various suitable valves. I have thought the 6L6 draws less than GEC KT66. Can anyone expand on this, perhaps recommending the best valves.

Also, some protection for the HT may be sensible. Can anyone recommend where to put fuses and what values to use.

Regards, Paul.

I have posted this here because more sensible and technical people seem to be on this site than say a Quad specialist site.
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