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In Reply to: RE: Rectifer Tube Choice for easy on the other components............. posted by Cut-Throat on April 01, 2021 at 16:53:19
I vote for the 5y3.
Edits: 04/02/21Follow Ups:
An answer!
When the builder said it was OK to use either the 5Y3 or the 5U4 I'm sure they were thinking in terms of how much B+ voltage the circuit would see as a result. Both of them drop quite a bit of voltage and the resultant B+ is in the range the builder suggests.The exact voltage drop will vary depending on the circuit but the data I've seen indicates a 60v drop for the 5Y3 and 44v for the 5U4. So the 5Y3 will result in slightly lower B+, but the builder said either one is fine.
Of the two, the 5Y3 will stress the amp less because its heater only draws 2A, while the 5U4 draws 3A.
The other factor is fast vs slow startup. Both the 5Y3 and the 5U4 are directly heated which means fast startup. If you want to minimize stress, slow startup is preferable. Some versions of the 5Y3, such as the 6087 and others listed earlier, are indirectly heated versions which will give you a slow startup.
So the least stressful would be one of these indirectly heated versions of the 5Y3.
There are other indirectly heated 5v octal rectifiers, most notably the 5AR4, but they drop considerably less voltage and the resultant B+ would be higher than the builder suggests, so it should not be used.
Edits: 04/03/21
Also, the Amp builder said that a 5V4G could also be used in my 45 Korneff Clone Monoblocks. And since this is an indirectly heated tube, I am thinking that this may have the slow start up characteristics and may stress the amps less. His actual comments on the 5V4 vs. the 5U4 were as follows.
"I think the 5V4 will be fine. The 5U4 can is capable of handling more current draw, like 200 mA, compared to the 5V4 that can handle up to 150 mA. Each block only draws about 40-50 mA so you will be okay. 5V4 also drops less voltage which will add slightly more to the plate voltage on the 45."
Thanks Again!
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