Good evening everyone. I'm new to the world of forums, so if I breach etiquette, I apologize in advance.
I've acquired an EZ81 and an EL84, both Pinnacle brand. I have been searching for weeks for data sheets with no success. I especially need the data sheet for the rectifier.
Does anyone know where I could find them?
Thanks,
David
I've acquired an EZ81 and an EL84, both Pinnacle brand. I have been searching for weeks for data sheets with no success. I especially need the data sheet for the rectifier.
Does anyone know where I could find them?
Thanks,
David
David,
"Pinnacle" is not a factory, it is a reseller of Russian or surplus bulk stock tubes.
Tube data sheet from any manufacturer will be OK.
Sorry HolowState, I did not see your post
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Are you sure they sold Russian types. I seem to remember Pinnacle being around in the 60s and I don't think anyone was buying tubes from the Russians back then.
Cheers
Ian
Hollowstate and RajkoM, thank you for your fast replies. I knew that pinnacle was an importer, and that's why I'm concerned. I've seen other rectifiers have vastly different maximum plate voltages, sometimes a 100 volt difference. Do you all have any advice, in terms of considerations when designing a power supply? Cheers
Pinnacle sold a mixture of East and West European valves, usually from the better manufacturers such as Mullard/Philips, Hungarian Tungsram, Brimar, Mazda, Polam. I don't think I have seen any Russian Pinnacles. Generally better quality than a typical rebrander. You should be able to assume that the valves will meet the spec given in any European datasheet from the 1960s.
When designing a PSU with a valve rectifier you should realise that the maximum ratings are not cliff-edges but slopes. Keep well within them and the rectifier will have a long and happy life. Go outside them and it will still work, but not for long. You can exceed one rating by a small amount provided that you keep well within the other ratings. The critical ratings are max inverse voltage, max current and minimum series resistance.
People often ignore or misunderstand the resistance rating. In most cases it will be almost satisfied by transformer resistance (secondary plus reflected primary).
When designing a PSU with a valve rectifier you should realise that the maximum ratings are not cliff-edges but slopes. Keep well within them and the rectifier will have a long and happy life. Go outside them and it will still work, but not for long. You can exceed one rating by a small amount provided that you keep well within the other ratings. The critical ratings are max inverse voltage, max current and minimum series resistance.
People often ignore or misunderstand the resistance rating. In most cases it will be almost satisfied by transformer resistance (secondary plus reflected primary).
Yes.
During "cold war" era many Western tube manufacturers/sellers (with its own logo) were selling Russian tubes. Especially Ray Theon (Raytheon).
Russian valves were only sold under the names of Western valve manufacturers right at the end of the valve era, when Western valve factories were closing down. Before that they could be obtained from some Western rebranders, but not Pinnacle.
Rebranders varied in the quality you could expect. Some sold Western makes, some Eastern makes, some russian, some seconds. I once bought a box of rebranded 6/30L2 (only made by Brimar as far as I know) which appeared to be seconds: many were wonky (but otherwise OK), and a few had internal shorts.
Rebranders varied in the quality you could expect. Some sold Western makes, some Eastern makes, some russian, some seconds. I once bought a box of rebranded 6/30L2 (only made by Brimar as far as I know) which appeared to be seconds: many were wonky (but otherwise OK), and a few had internal shorts.
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