I think I figured it out. Does not fully compute in my relatively non- technical head, but here is what transpired: On the assumption that it might be a ground...
Hi, I have been offered a quad of EL37 valves. Can I use these valves in the Quad II/II amps? Will there be problems with the current draw?I do not use the...
Congratulations; you are a very lucky man - NOS EL37s are very valuable. The EL37 used to be considered as a plug-in replacement for KT66 back in the 1960s;...
And I was just about to say they won't work and offer £100! IIRC I remember reading that in a (Leak ST50) shootout the EL37 was preferred over anything else. ...
Always my problem - a big mouth. They are probably worth at least £75 each! When I was building amplifiers I would have loved to have had some; they make...
Fifteen shillings (plus whatever purchase tax rate applied) was a lot to pay. About 7.5% of "average" income which in the early 1960s wasn't much higher than...
This was late 1960s - and he still had them in the 1970s; I know this because I bought a pair around 1976! The price of fifteen bob/75p was what one paid,...
Aye - if we only could have known then..... I have a hundred or more valves acquired over the decades and this reminds me they're not doing much good stored in...
Hi, I got the correct plug for my ESL57, and shark banana speaker plugs at Maplins. When the plug is inserted in the ESL57 the red power indicater at the back...
I have an old QUAD II (serial 3218) with an output trafo (T1) with only 10 connections marked A-J. In the schema there 11 connections marked P-Z. There has...
Hi, Thanks to all who replied. I am meeting the person with the EL37 valves this weekend.Fingers crossed the valves are NOS and in good condition. Regards ...
Yes - there's quite a mix including fings wot fit Quads :-) When I were but a young harmonic, 300A and B were just the sort of valve to make a luvverly popping...
Hi, Anyone here have a pair of the round Quad Speaker cables for sale? or know where I can get them, cable model QLSCR4. Kind regards Cham TS Recent Activity...
If an ESL-57 has been disconnected from the mains for a long time so that the HT has disappeared it still produces sound in my experience, so I would guess...
Hi Hans, I am trying to eliminate all the possiblities, Can you recommend a suitable ohmmeter for a accurate reading of the ESL57 speaker terminals ? ...
Hi Alex Electrically the ESL57 is quite a simple device. The circuit diagram is easily available and since it isn't making any sound at all there are only a...
Hi Paul, Thank you very much for your informative post. Unfortunately I am not based in the UK although make frequent visits, as I would take you up on...
Alex: Any inexpensive meter you get from an electronics store will work. Keep in mind the primary (input) of a transformer will have very low resistance at DC...
There are meters of all qualities and accuracies at Maplin but I find most merit in simplicity and reliability. Whatever you choose, learn to use it well and...
... The primary DC resistance of the step up transformer of the ESL 57 will be around 0.5 ohms. So use the lowest range of the ohm meter. -- Best, Goran...
Hi Stefaan Looks interesting enough- I'm on the look out for a new multimeter, as mine has definitely gone on the blink, don't know why.... Can one attach the...
I suppose it's not too silly, to ask if the speaker signal lead works with another speaker? Derek UK [Non-text portions of this message have been removed]...
Sorry to go off on a tangent here, I've not used a multimeter for years and never a digital one like I bought recently. Is the voltage supposed to range all...
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