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Audio and Video Talk
Valves / Vacuum Tubes
Anyone seen one of these? (Vintage naked pics)
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<blockquote data-quote="Ampdog" data-source="post: 540081" data-attributes="member: 144"><p><em>WHAT THE ....?</em></p><p></p><p>Where did you get hold of this??</p><p></p><p>W.L. Procter was the hi-fi shop in Cape Town when I was a student. I had a hand in this, also reviewed it in the U.S. Engineering Student Magazine in the late 50s. Mr Procter was some 15 years my senior, so if still alive he would be going on 100. If I recall he gained experience in electronics in WW II before coming to S.A. His Cape shop was under "W L Proctor" and the Joburg one under "Lovell Procter". Much of our limited student funds went thataway at the time. </p><p></p><p>The components were from Hamrad and Romeo (Italian) in the same area as his shop in Cape Town. Transformers were locally wound by a firm I cannot recall, improved OPT design by myself in later models. The ones in your picture look extremely poorly assembled; you might consider taking them apart and at least clamping the cores with less of an air-gap, repaint etc. I still have some Ducati caps here, still measuring fine. The green-bodied resistors - mmmm. They could drift quite somewhat.</p><p></p><p>The relevant magazine is long gone by now although I kept them. From memory, the amp had an input triode, passive tone controls, triode driver and EL84 output valve, the latter two included in a feedback loop. Yes, sensitivity was about 250mV for ceramic or crystal pick-ups, output some 4W. Loudspeaker in the same cabinet was a Richard Allan, very popular in those days. If I recall correctly, some models had a Garrard record player in the same cabinet, somehow managed to keep bass vibrations away from the player!</p></blockquote><p></p>
[QUOTE="Ampdog, post: 540081, member: 144"] [i]WHAT THE ....?[/i] Where did you get hold of this?? W.L. Procter was the hi-fi shop in Cape Town when I was a student. I had a hand in this, also reviewed it in the U.S. Engineering Student Magazine in the late 50s. Mr Procter was some 15 years my senior, so if still alive he would be going on 100. If I recall he gained experience in electronics in WW II before coming to S.A. His Cape shop was under "W L Proctor" and the Joburg one under "Lovell Procter". Much of our limited student funds went thataway at the time. The components were from Hamrad and Romeo (Italian) in the same area as his shop in Cape Town. Transformers were locally wound by a firm I cannot recall, improved OPT design by myself in later models. The ones in your picture look extremely poorly assembled; you might consider taking them apart and at least clamping the cores with less of an air-gap, repaint etc. I still have some Ducati caps here, still measuring fine. The green-bodied resistors - mmmm. They could drift quite somewhat. The relevant magazine is long gone by now although I kept them. From memory, the amp had an input triode, passive tone controls, triode driver and EL84 output valve, the latter two included in a feedback loop. Yes, sensitivity was about 250mV for ceramic or crystal pick-ups, output some 4W. Loudspeaker in the same cabinet was a Richard Allan, very popular in those days. If I recall correctly, some models had a Garrard record player in the same cabinet, somehow managed to keep bass vibrations away from the player! [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Anyone seen one of these? (Vintage naked pics)
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