AVO avo 163 valve tester free download

File name avo_163_valve_tester.pdf

Mega Deals on Meters Great prices on insulation meters Buy now and save mega bucks! www.testandtagsupplies.com Deadweight Testers Hydraulic & pneumatic, high & low pressure. High quality as standard. www.deadweighttesters.co Hach Australia Australian Hach Distributor Hach Preferred Process Distributor www.pryde.com.au Restoration and repair to vintage AVO Valve / tube tester early valve tube technology, The AVO 163 Valve Tube characteristic meter V.C.M. Just purchased on ebay, going cheap as one of the meters is missing . I am going to fit an alternative meter and match it to the machine using an Op Amp. The design for this comes from a fellow member of the B.V.W.S. Gary Tempest it uses a 8 pin I.C. TL071 (741) Gary has successfully used the method on Mk 1s and 3s. The avo unit is superbly engineered, I would love to know its price when new. The switching design has been changed from all the previous models, with a much smoother action, and solid state technology has been introduced. This has greatly simplified the testing method with no need to do the backing off. it is all carried out and continuously monitored with the Right hand meter. A small signal about 20 K/hz is superimposed on the rectified A.C. fed to the control grid, the signal is sampled at the anode and is displayed on the G/M meter. You can just see the 20 k/hz signal on the scope display. After giving the unit the once over I have found by using the standardized valve that the instrument is over reading about 25% on the 100 m/a scale and 10 % on the 30 m/a scale, the 10 and 3 seem ok. The left-hand meter has proven to be faulty, with an internal resistance of 2160ohms. It should be 2400 ohms. I have had a word with fellow B.V.W.S. member Denis Tabor, Denis tells me that Avo brought out Taylor meters in the late 60s and the meters installed in these instruments are in fact made by Taylor instruments Ltd, and were not that good. Nothing like the quality of the Avos in earlier testers. Denis is a font of all knowledge on the subject of valve / tube testers of all makes worldwide and is always keen to help. Checking the shunt resistors R11, R12, 2.4 and 8.02 ohms they are slightly high, The 2.4 has risen to 2.7 this will make a big difference to the readings. These resistors were Probably damaged due to incorrect switch settings, and serious overloads during its 40 years of service. It looks as if I will have to buy 2 meters. One problem encountered is removing the control knobs they have every small Allen key screws 2 on each knob . One supplier of these small keys is C.P.C. Part number TLO3270 and priced at