(Updated 5/06)

AMPLIFIER NOISE 10/30/02

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 reduce the possibility of high frequency oscillation, we are recommending the addition of a 33 pf capacitor across R5 and one across R11. These capacitors have been included with all kits sold after 10/30/02.

Further noise reduction can be obtained by grounding the volume control body and in severe cases grounding the output and power transformer frames. The most convenient circuit ground is the – side (black post) of the output terminals. A single conductor hook-up wire from ground to one of each of the transformer mounting screws and to the volume control bushing will achieve maximum noise reduction.

As of 12/03 all amplifier kits come with a grounding lug for the volume control.

TUBE SOCKETS

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.

TUBES

As of 12/20/05 these amplifier kits are using the 10GV8 tubes. The performance is the same as previous units; only a slight change has been made to the circuit to accommodate these tubes.