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Old 22nd June 2012, 05:35 PM   #1
diyAudio Member
Join Date: Dec 2005
Location: Loganville, GA
Default RH-84 voltages

Hello all,

I'm in the testing phase of my RH-84 amp.
Here are the voltages I get. I would like to know what other builders
are getting...
B+ 304dc

6BQ5 plate +294.8dc +294.3dc
screen +296.2dc +294.4dc
cat +9.3dc +10.2dc

12AT7 plate +171.6dc +171.3dc
cat +1.2dc +1.2dc
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File Type: jpg test-setup.JPG (125.9 KB, 235 views)
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Old 22nd June 2012, 08:06 PM   #2
diyAudio Member
Join Date: Dec 2005
Location: Loganville, GA
I forgot about current draw. I put an amp meter just to the left of where the
choke would be (i used a 250 ohm resistor) and get 98/99 ma.
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Old 23rd June 2012, 09:49 AM   #3
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Join Date: Sep 2005
Location: the leafy west of Brisbane
Default PCB for RH84?


I'm curious about the pcb in the photo. Did you make it yourself or are pcb's for the RH84 available?

I'd like to know because I have been gathering parts and will soon start to assemble my own RH84.

Doug (Brisbane, Australia)
A speaker-builder's parable: "That burned down, fell over, then sank into the swamp. But the fourth one stayed up. And that's what you're going to get, Lad, the strongest castle of all."
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Old 23rd June 2012, 02:25 PM   #4
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Join Date: Dec 2005
Location: Loganville, GA
The PCB is my own creation.
This power amp is my 2nd PCB project. I built an RIAA pre-amp to listen to my
vinyl records and needed a power amp also.

Want help - RCA Tube Manual RIAA Phono Stage
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