Since the transformers and volume control are mounted on a wooden board, there can be some coupling of power line noise or high frequencies into the volume control.
To stop the possibility of high frequency oscillations, due to the coupling from the output to the input the volume control body and the output transformers frames should be grounded. The most convenient circuit ground is the – side (black post) of the output terminals. A hook-up wire from ground to one of each of the output transformer's mounting screws and to the volume control bushing will achieve maximum noise reduction. These must be good / clean electrical connections.
Some of the first kits contained tube sockets that were not made from ceramic.
Special high temperature spacers are available, upon request, for these older kits.
As of 6/03 all kits contain "Ceramic" tube sockets.
As of 12/20/05 the "G" amplifier kits are using the 10GV8 tubes. The performance is the same as original amplifiers; only a slight change has been made to the circuit to accommodate these tubes.
TECHNICAL NOTES AND UPDATES
Page Updated November 2013
The power transformer for the "L" series kits are not compatable with the "G" series, as the filiament (heater) voltage is different. If you have 240 VAC power we recommend the "L" series, as they have a duel input voltage transformer. The "L" series was designed to replace the "G" series and therefore is comparatible in performance.