SLP-05 question (plate current and plate voltage readings)
I have a SLP-05 preamp and I really enjoy it, but I have looked everywhere to find out what the correct plate voltage and plate current voltage should be.
Can you please tell me what the readings should be? They are currently: 1) Plate voltage: ( 248 VDC) 2) Plate current: (54 ma.) If low, what would cause that and how to correct it? (New rectifier tube?) It does sounds good though... The manual does not explain that very clearly to me. (maybe I am thick though!) |
Talk to Steve Witek at steve@caryaudio.com at Cary. He has always been helpful and answered all my questions. Will provide most any info other than providing actual schematics.
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Steve just replied:
One meter reads the main high voltage out to the tubes. It will read around 210V to about 230V depending on your AC voltage coming in. When your AC voltage is higher the transformer will produce a higher main high voltage. Sometimes as high as 238V This is fine. The higher the better. If you have no voltage here then you need to check the fuses and maybe the 5AR4 rectifier tube. The other meter reads the current being consumed by the tubes. This will usually read (depending on the tubes used) around 50ma to 65ma. No problem here. If it one day reads high like 90 or higher then you may have a bad tube that is causing a short and drawing too much current. Turn it off. Then it's a good time to test your tubes or get new ones. |
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oceansmagnet... Welcome to AA! :wave:
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I really like this preamp a lot! I have installed a set of the Pope NOS 6SN7 tubes and a Philips metal base mini watt 5AR4 Rectifier Tube in Power Supply.
Beautiful sound... Joey V (he posts a lot on this site) suggested it and I am very happy that he did!! |
Thanks for the response Mike. I've heard nothing but good things about the Cary preamps.
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