hello ,
me tested only EL / PL 504 and EL 502 AND PL 511 😉
very good build to EL 502 for middle power .
tks for docs to EL 509 / 6 P 45 S me use only amplificator to band HF 80 M to TEN METER 😀
😉
me tested only EL / PL 504 and EL 502 AND PL 511 😉
very good build to EL 502 for middle power .
tks for docs to EL 509 / 6 P 45 S me use only amplificator to band HF 80 M to TEN METER 😀
😉
hello
I know this thread is out of date, but a good guide for the exchange of el503 by el36 finds here, is however for a geloso amplifier !
Conversion of EL503 Tube Amplifiers
I know this thread is out of date, but a good guide for the exchange of el503 by el36 finds here, is however for a geloso amplifier !
Conversion of EL503 Tube Amplifiers
There are no real substitutes for the EL503, a very peculiar (philips design) and short-lived tube. Conversion to TV horizontal sweep tubes is sometimes possible but is a major work, needing replacement of tube sockets, different biasing and screen supply circuits, adding extra transformer(s),etc... all this for unknow (or degraded) performances at the end. Problem is that the EL503 was only used in P.A and cheap guitar/instruments amps who doesn't worth all the expenses and efforts needed. Actually I've never seen a EL503 used in a Hi-Fi amp. This tube was designed to work with a high cathode current and is nearly allways exhausted, my advice is to stay away from any amp using it, even if you get it free.
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