Mullard High Speed Valve Tester.Type E7600
The Mullard High Speed Valve Tester, is a mid 20th century instrument,designed for the testing of new and used valves, to approved limits.The ease with which valves could readily be checked by this unit,made it a very popular tester with maintenance engineers.Operation of the tester was made very simple, by the use of paxolin punched cards.The appropriate card for the valve under test is inserted in the machine and a gate switch automatically makes all the required circuit connections.Afterwhich a single rotary switch selects various tests, in sequence and the results are indicated by the position of a spot on a cathode ray tube.A coloured scale indicates whether or not,the valve is within prescribed limits.A difficulty which sometimes arises from the collectors viewpoint, is that over the years, the cards required to operate these machines often become lost.Fortunately,this is not a problem with the instrument which we are able to offer as this retains not only the special aluminium boxes, originally supplied by Mullard for card storage,but more importantly, has a full compliment of test cards, covering a large range of valve types.
The Valve Tester is in good condition,and aside from the fact that at some time in the last 50 years the case paintwork has been restored,the internals and all knobs and controls, etc., are totally original.It comes with a copy of the Mullard Technical and Operating Manual,together with the relevant Mullard Numerical list of Valve Test Cards.This vintage valve tester would make an interesting addition to any collection,especially, as it is in working order.The price is $980 U.S.Dollars,which includes the cost of air freight to the USA.
Telegraph Signal Generator Model TSG20
The TSG20 was manufactured by the Plessey Company and designed for line and teleprinter machine testing.The fully protected electronic relay is capable of switching double current signals from 3-0-3 to 115 volts or 6-230 volts single current,both at up to 100mA.Test signals are provided from 20-5000 bauds.The unit produces a text message,repeating characters,continuous mark and space and 1:1 or 2:2 reversals.RF protection is provided.The generator is in very good,untested condition and has not been modified in any way.An unusual collectors item, at modest price, of $245 U.S.Dollars,which includes the cost of air freight to the USA.
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