I know this should be posted at some guitar amp forum somewhere ,but it may be of interest here in the Lab forum.
Found this amp at a music store in non-working condition for $20
I have an obscure tube labeled "KWBA"
made by Raytheon , made in the USA. Used as a power output tube on a single ended tube guitar amplifier. The Amplifier is a Gene Leis model 908, made in Manhattan Beach, California dated 1968. Would love to find a schematic for this amp too. its very simple 3-5 watt amp, kinda like a Fender champ but a different circuit inside. Tube compliment is 35Z5GT, 50L6GT, 35W4, 12AX7A. Filter cap is a 50mfd-50mfd/150V
I have looked high and low and cannot find a datasheet or cross reference on this tube anywhere on the web. It shares same pin compatability as a 6V6 or SL6. However it cannot be substituted for
a 6v6, I have tried to plug a 6V6 in place and it did'nt work on the amp.
Below are some pictures of the KWBA
tube. I believe the tube is a
power tube because it is connected to a output transformer that feeds a small 8 ohm speaker. The rectifier tube feeding the KWBA is a 35Z5GT which is being powered from 120VAC line voltage thru a pilot lamp. There is no power transformer in this amp.