Quad used KT-88s, and after KT-88s came Philips EL-34. Wished I still
had my VADEMECUM. The benefit with KT-88 was that you could lower the
anode voltage from +400 VDC to +250 VDC. I got a 400 Volt flash through
my body from these horrible (600 V) electrolytic capacitors. I tried to
maximize the output power by increasing the anode voltage from +400 VDC
to +500 VDC, with the result that one of the capacitors exploded. It
reminded of a geyser, and the electrolyte hit even my face. I realized
afterwards how stupid this was. I ought to use two KT-66 in parallel
instead. In total four tubes in the output stage. But you need a grid
bias balance network. Like trimming double carburators.

KT-66 had one unique and spectacular property: if you switched off the
room light, and used maximum grid amplitude, you could "see" the music
when the electron beam was modulated.

Inge

-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För [log in to unmask]
Skickat: den 21 maj 2007 21:33
Till: [log in to unmask]
Ämne: Re: [TN] Friday TechnoTopic

As I recall, after building a WM5 Heathkit Williamson amp using Mullard
(?)  
KT-66 tubes, a later one was issued with KT-88s. Does anyone recall
these?  

Bill  Kenyon
Global Centre Consulting
3336 Birmingham Drive
Fort Collins, CO  80526
Tel: 970.207.9586   Cell:  970.980.6373




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