Valve Gallery -
Valves: U52, 80,
|Shown above is a Marconi Osram U52 rectifier.
With an International Octal (I.O.) base this rectifier has a 5v
heater. This is a highly rated device, capable of handling a maximum
of 500v and I of 250mA. It is a substantial device approx 135mm
high, still used today in high end audio amplifiers.
||Shown above are two 80 rectifiers. The
left hand image shows the rectifier in its earliest form with balloon
glass envelope, and the right hand shows how the rectifier was reduced in
size as further valve development occurred. With a 5v heater, they
use a UX4 base. Left hand rectifier from Philco is 140mm height,
whilst right hand is Sylvania of 125mm height. Each can handle
max voltage of 350v at I of 125mA.
|Another couple of less common rectifiers for the
bottom pictures again. This UY21 from Mullard has a heater of
50v. At 95mm height it maximum voltage of 250v at Max I of
140mA. Uses a B8G base with height of 95mm.
||Shown above is a EY51 rectifier from Mullard.
This has a heater voltage of 6.3v and utilises the little used B2A base
that incorporates wire lead-outs instead of pins. Maximum voltage of 5000v and Max I of
3mA. It is of 60mm height.
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Amplifiers gallery page
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