DIY Audio Projects Forum

Alternative tubes
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Author:  Chrisuk [ 02 Jan 2020, 12:01 ]
Post subject:  Alternative tubes

Hi, this is my 1st post so pls excuse me if I break the rules.
I have an amp (gemtune bl-02 model EL34-B) I have eventually managed to get a copy of the manual so now I know what valves go in what position however the valves listed are not all the same as what I have.
I have 2 x EL34-B which is correct
I have 2 x 6h9c which according to the manual should be 6n9p
And rather than a 5z3p I have a 5u4g.
Would I be right in thinking that these could be acceptable alternatives and would just deliver a different type of sound or would they blow or just not work if they were used?
Any feedback/info would be greatly appreciated, if anyone could put a monetary value on the amp Inc valves that would be great although I know this could be a long shot.

Author:  ILoveHiFi [ 03 Jan 2020, 00:54 ]
Post subject:  Re: Alternative tubes

You can use any valves as long as the power ratings are smiliar, for generall valve amps can use any type of valve.

Tune the resistor values to have correct operating point and desired voltage gain.

Author:  Chrisuk [ 03 Jan 2020, 06:13 ]
Post subject:  Re: Alternative tubes

Thanks for the response. I wouldn't know where to start with tuning resisters but I have a guy who knows about that kinda thing thanks

Author:  Woodo [ 03 Jan 2020, 17:53 ]
Post subject:  Re: Alternative tubes

Hi, there’s a link to a resource on this forum that might help look at compatible tubes with different numbering. Refer to

Also someone familiar with the different tubes may chime in if not on holidays at this time :)

Russian and Chinese tubes often have different numbering but may be the same or compatible..The Tung Sol entry for the 5U4G attached mentions other compatible rectifiers.

A very interesting thread on rectifiers.. a couple of mentions of the 5Z3. I have used 5U4G and 5AR4 (GZ34). Less voltage drop with the 5AR4. viewtopic.php?f=9&t=2912&start=10

Author:  Chrisuk [ 07 Jan 2020, 05:33 ]
Post subject:  Re: Alternative tubes

Thanks john

Author:  tmi [ 22 Jan 2020, 20:07 ]
Post subject:  Re: Alternative tubes

Hi, 6h9c is the russian version of 6sl7 and 6n9p is the chinese version of the same tube, so that is the correct tube.

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