QUAD II amplifiers are one of the most popular items bought on eBay. Here are a few pointers that might be useful. Buyers tend to favour amplifiers with very close serial numbers but this is not really...
A question I hear a lot. Do I need to have my Valve amplifier biased? So What is Bias. Well to put it simply the bias of a Valve amp is set by adjusting the grid voltages to set the idle current of the...
Quad 33/303 Amplifier General These amplifiers were made from 1967 and had a production run of about 15 years. They were one of the best amplifiers around at that time for both design and technical...
Voc Rock Guitars Audio Reviews on ECC83 12AX7 Pre amp tubes. Essentially there are only 3 major tube manufacturers remaining in the world today. We decided to put the 3 most popular tubes manufactured by...
If you are thinking about purchasing a vintage Akai tape recorder I though a few tips on things to look out for /common faults might be useful. Akai recorders were the very top end of the domestic market in...
Marshall DSL50 Valve Biasing. When replacing or changing power valves in this amp or others like it, it is important to purchase a matched pair of power valves from your supplier. The power valves in the...
Maplin Echorder E444 The Maplin Echorder is an analogue delay-line system which means it uses digital chips to process the sound in an analogue fashion using the bucket brigade delay line system (BBD)-...