08-23-2011, 12:58 PM
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Grumpy, Cranky Repairman
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Join Date: Apr 2008
Location: Cornpatch of Iowa
Keep in mind that although the 6LB6 will work as a replacement for an 8950, your power output will drop a little bit, as the 6LB6's are around 33W plate dissipation per tube, vs. 40W plate dissipation for an 8950.
Just tie the filaments in series with the 6LB6's, and you should be good to go. Most of the inter-electrode capacitances are fairly close, so you shouldn't have too much trouble tuning up the amp. Just keep your input wattage down so you don't over-drive the tubes. Good luck!
Bases: Cobra 2000 GTL, President Washington, President Madison, Tram D201A
Mobiles: Cobra 146GTL, Midland 79-893 (NIB), Midland 13-893 (27.555), President P300