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Hoffman Amps Forum image Author Topic: R4YB for GZ34  (Read 2584 times)

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Offline Oddvar

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R4YB for GZ34
« on: June 08, 2016, 11:09:40 am »
Does anyone no if it's adviseable or possible to swap a RCA R4YB for a GZ34?
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Offline sluckey

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Re: R4YB for GZ34
« Reply #1 on: June 08, 2016, 11:36:49 am »
I've never heard of a R4YB.
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Offline Oddvar

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Re: R4YB for GZ34
« Reply #2 on: June 08, 2016, 01:07:10 pm »
Same as 5R4GYB
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Offline eleventeen

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Re: R4YB for GZ34
« Reply #3 on: June 08, 2016, 02:06:45 pm »
It will work, and it will not draw too much filament current. It will drop considerably more volts, about 50 more volts.


5AR4/GZ34-5DA  - 5.0   - 1.9  ->>> 17 <<<   - 250    - 450 - low Vdrop 5U4/5Y




5R4-GYA - 5T   - 5.0   - 2.0  - >>> 67 <<<   - 250    - 750 - high voltage 5U4 (ruggedized)


>>>  nominal voltage drop <<<
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Offline sluckey

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Re: R4YB for GZ34
« Reply #4 on: June 08, 2016, 02:35:31 pm »
Quote from: Oddvar on June 08, 2016, 01:07:10 pm
Same as 5R4GYB
5R4 makes sense. R4YB makes no sense. Google can't even find anything 'tube' related for R4YB.

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A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline Oddvar

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Re: R4YB for GZ34
« Reply #5 on: June 08, 2016, 04:00:43 pm »
It says R4YB on it...
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Offline sluckey

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Re: R4YB for GZ34
« Reply #6 on: June 08, 2016, 05:17:28 pm »
Quote from: Oddvar on June 08, 2016, 04:00:43 pm
It says R4YB on it...
I wonder if there was ever a 5 in front of that R4YB at some time?  :icon_biggrin:
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A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline jjasilli

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Re: R4YB for GZ34
« Reply #7 on: June 08, 2016, 08:07:01 pm »
Quote from: Oddvar on June 08, 2016, 04:00:43 pm
It says R4YB on it...


The lettering sometimes rubs or wears off.
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