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GZ34/5AR4 types including Russian 5C4M

Posted on July 20, 2023 at 02:12:20
andy evans

Posts: 4340
Joined: October 20, 2000
Looking to buy one or two more GZ34 types for my SE 2a3 amp. Staying on the economy side of things so no pricey NOS. I like the Sovtek I have, but open to others.

I see many 5C4M for sale in Ukraine. What is this - is it a 5Z4, or a 5Y3GB according to Frank's site? Data on Frank suggests it's a 5Y3GB but that's 125mA current and 1.7A. I read first cap is 4uF max. So looks like it's not an equivalent since stated max current is 140mA and it's also 2A/5V. It's 28 mm in diameter and, excluding the IO base pins, 65 mm tall. GZ34 is 75mm tall and 32mm diameter................Anyone used it and can report?


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RE: GZ34/5AR4 types including Russian 5C4M, posted on July 21, 2023 at 04:41:52

Posts: 1465
Location: USA
Joined: August 8, 2014
Sovtek 5Y3GT are an odd cathode filament unlike real 5Y3Gt tubes that act like a 5V4 low voltage drop, but rated at 140ma current. They are like a low current GZ-34.


RE: GZ34/5AR4 types including Russian 5C4M, posted on September 22, 2023 at 03:59:27

Posts: 1
Joined: March 10, 2023
Sovtek tubes are like the bottom of the barrel in fidelity.Look to Sylvania,
GE or new world Genalex GZ34.Your ears deserve better.


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