I'm with Roger.
Modern is simple and light weight. Do away with all that iron.
Get the transformer rewound. A bunch of 6A10 diodes with a string of
electrolytics and MOF resistors and the job is done.
Also, if you're gonna stick with the tetrode, do the upgrade to the FU728F.
Good luck,
Alek.
On 13/07/2015 3:01 PM, Roger (K8RI) wrote:
I'd build a new amp that would easily run the legal limit, any mode,
no time limit. IF the transformer is good after baking out then
restoration is likely the cheaper route, but use the SS tube
replacements and keep the rectifiers handy as you could still sell it
as a restoration.
IF you are not going to do a restoration. Modern PS and modern amp.
Choice is what to use for a tube or tubes and whether triode or tetrode.
73
Roger (K8RI)
.
I've got a bit of a basket case 30S-1. Much of the power supply iron may
well be junk. Sat submerged in flood water for well over a month and that
was a few years back.
Getting toward thinking about reworking it I'm wondering if I can improve
things a bit. Not in terms of what it was but what it might be. So if you
were rebuilding such a plate supply would you still do it the same way,
centre tapped trafo, tube rectifiers, resonant choke filter, big
bleeders?
Or is a more modern approach, single secondary winding, bridge rectifier
and stack of electrolytics more the way to go?
Though there's quite a bit of interlocking and protection in the way the
power supply is arranged it all seems fairly straightforward.
Martin, HS0ZED
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