5U4 vs 5Z4 tubes

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5U4 vs 5Z4 tubes

bridkarl
Member

Posts: 216
Threads: 48
Joined: May 2023
City: Pocatello State, Province, Country: idaho

Yesterday, 01:54 PM

I grabbed the wrong tube and put in a 5U4 tube instead of the 5Z4 - I just had the rectifier in with no other tubes.
After 30 seconds I realised I was wrong and turned off the variac. No fuses blown, no issues, but I did get heater voltage since the pilot light came on.
No harm done, but I didn’t think these substiuted at all.

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Messages In This Thread

5U4 vs 5Z4 tubes - by bridkarl - Yesterday, 01:54 PM

RE: 5U4 vs 5Z4 tubes - by GarySP - Yesterday, 02:30 PM

RE: 5U4 vs 5Z4 tubes - by bridkarl - Yesterday, 02:37 PM

RE: 5U4 vs 5Z4 tubes - by Vlad95 - Yesterday, 11:02 PM

RE: 5U4 vs 5Z4 tubes - by Arran - 11 hours ago

RE: 5U4 vs 5Z4 tubes - by bridkarl - 3 hours ago

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RodB :beerchug:Vlad95 — 10:22 AM
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Vlad, you nailed it. Swiss and German roots.RodB — 09:54 AM
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Well this is a Hallicrafters SX/9 circa 1936. No real issues so far although I dodged a real bullet with a cap that was...bridkarl — 07:59 AM
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