Current slide {CURRENT_SLIDE} of {TOTAL_SLIDES}- Best Selling in Vintage Tubes & Tube Sockets
From the 4 replacement valves sent out I selected 2 that were closely matched. They worked Okay but I was unable to get the expected output from the linear amplifier. The screen currents turned positive very quickly, no amount of careful adjustment of loading could get the power to where it should have been. I have fitted 4CX 250b's and made the necessary circuit adjustments to suit the different operating conditions of these valves and get well in excess of the required output now I can find no reason for the low output other than the valves. A pair advertised as having done "about a years service" gave some 25 - 30% more output. To be fair the supplier was excellent and sold as "tested new old stock", but could not check for full output.
Verified purchase: Yes | Condition: Pre-owned