Bellow is a list of thermionic valves I have for Sale — They are mainly British or US made New Old Stock [NOS] which are Fully Tested to the Manufacturers or the AVO 163 spec before shipping

—ALL PRICES ARE GREAT BRITISH POUND — GBP or £ —

Unless stated otherwise the price is for a single item — Postage and packing is charged at cost and added to the total price on confirmation of your delivery address — I can only accept cheques or cash in GBP or PayPay once we have established the total and that the valves test Ok for sale

I have other Radio and computer valves not yet listed so please contact me — I also have many used or badly stored Audio valves which test good but have worn or no manufacturer logos so if you don't care about the looks and want a good know working valve please ask

I BUY VALVES — but like everyone else I am mainly interested in such items as ECC83, EF804S, EF806S, EL34, KT66, KT67D, GZ32 — Also any NOS valves that fail test but look good for art projects — display or TV and Film props

I TEST VALVES — If you have valves you want tested the typical cost is about 3GBP per valve plus the postage both ways — Normal testing is done using an AVO 163 which can also be used to plot a number of static data points if required — Dynamic A-B comparison against a known good valve or manufacturers graph or dynamic pairing is done using a TEK 576 curve tracer which covers the full operating range of most valves — See bottom of this page —

Dynamic testing and comparison of valves using a TEK 576 curve tracer

This level of testing will often show differences in valves that are not obvious from the single point Ia and gm testing available with a valve tester — It also shows that many modern equivalent valves DO NOT follow the FULL characteristics of the original items which may explain reported differences between good NOS valves and some modern replacements