A typical collection of old valves

Occasionally, I buy or I'm offered a collection of valves. Sometimes the types are intriguing and a few days ago I received a collection from Chris Hampton of "Hampton Colours" Stroud (see below). The valves once belonged to his brother-in-law, a physics lecturer.

Below is the listing and, at first sight the valves are fairly standard, however they're not. Mostly collections are defunct TV valves put back in boxes belonging to their new replacements; rarely they're all radio valves, but in this case I suspect they were bought for things really technical, maybe early computer equipment?

They total 48 in all and are mostly what's termed "new old stock" with the 6060 and EAC91 being most prolific. The Brimar 6060 is classed as a "special quality" ECC81, which often means it was designed for much longer life. Although electrically similar to the ECC81 it has smaller electrodes and despite being thought of as an audio valve this particular version can be used at UHF up to 500MHz. Some of the valves listed below are datewise quite late and would represent examples from the end of the valve era.

At the end of my Electrical Engineering course at Liverpool University in the early 1960s I chose as my thesis a simple voice scrambler. This produced two low-frequency-chopped amplitude modulated signals transmitted on adjacent radio frequencies. To hear speech one needed two radio receivers. The equipment was built on an aluminium chassis and used mainly ECC81 valves. To make the project as legal as possible I chose frequencies in Top Band.

 
90C1
G55/1K
6060
EAC91
E92CC
 
E83F
85A2
150B2
0A2/150C2
EZ80
 
GTE175M
EF86
ECL86
EL822
12AT7
 
ECC81
ECC82
12AU7W
ECC83
ECC88
 
CV4014
ECC91
EB91
EF91
EN91/2D21

 

http://www.hamptoncolours.co.uk/

Hampton Colours Ltd
Manufacturer
Address: Toadsmoor Mills, Brimscombe, Stroud GL5 2UH
Phone:01453 731555

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