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6L6GC / 6BG6 x4 Ultralinear Guitar Amp
6L6GC / 6BG6 x4 Ultralinear Guitar Amp
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Old 22nd August 2012, 02:46 AM   #111
Tubelab_com is offline Tubelab_com  United States
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Join Date: Jul 2005
Location: West Virginia panhandle
Two months for boarding? LOL
Face through the glass maybe?

I can see the Florida Panthers arena from by kitchen window. I have seen more concerts than games there, but I did see the glass break once. Minimal bloodshead though. Don't even remember who was playing.
Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
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Old 22nd August 2012, 07:01 PM   #112
Cassiel is offline Cassiel  Libya
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Join Date: Sep 2004
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A pity, we need more funny members.
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Old 13th September 2012, 06:34 AM   #113
Struth is offline Struth  Canada
Join Date: Aug 2012
Location: books at londonpower.com
Hi Guys

Ian, that circuit is pretty common in hifi and is referred to as "low-z Drive" in DSN-1.

As far as the 100W amp project goes, if the 300-0300V PT is used in the lethargic half-bridge mode, B+ will only be 430V. Power into a 5k-aa OT is limited to about 36Wrms. Why 5k? Is it because Hammond lists such a unit? The 1650N at 4k3 is more like what production 100W amps use with four tubes driving. This is rated at 60W hifi but supports 100W easily for guitar which does not require full bass extension.

The 1650R 5k is designed to match a single pair of 6550s or KT88s. The latter can use the UL taps without question. For either tube, use at least a 1k-5W screen-stop regardless of output wiring (UL, triode, tetrode). This same detail applies to all power tubes in guitar amps.

The typical 1650R app calls for 600Va and usually 300-350Vs with no UL connection. The low screen voltage allows you to beat the plate quite liberally but also requires a cathode follower or TX driver to push the grids positive for full output.

Have fun
Kevin O'Connor
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