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57.70.8.3
In Reply to: Re: collective current posted by Ralph on September 20, 2006 at 15:13:32:
Hi Ralph , I sent you a pic of both my of amps together on the dining room table .
These are the voltages / references that I have measured in the amps are as followsOutput stage supply is 135 VDC
Driver Supply is +325 & -327 .
Bias value reference is approx -50
Pins 2 & 4 ( V4 ) is +292
Pins 1 & 4 ( v2 ) is 46.9 , and Pins 3 & 6 ( v2 ) is 53.2
Pins 3 & 6 ( V1 + 1.6
Pins 6 ( v3 ) is -92.7 , Pin 4 ( v3 ) is -95
Pins 1 ( v3 ) -226 & Pin 3 = -222Im not after more power , just wanting to confirm that I was measuring it correctly .
My original post was to describe how I was doing it ( at 1khz ) biased at 500 mA ...and then measured V squared / R ...with the Scope & Fluke DDM . The scopes Peak to Peak reading was multiplied by 0.707 ....and the Fluke DDM is good for 100Khz ( so it says )
I have a Fluke 734 02 seriesCheers Stu
New Zealand on 230 and up to 240 vac
Follow Ups:
Sounds to me like the B+ voltage is a little low. 140V is a better place to be. You could buck that up with a small auxilary transformer.
What is output stag v without tubes.with 135v unloded 150v.Is it good to pull down transformers?thanks T.V.
I have read youre request Tubevibb . What is youre output stages windings AC voltage ..measured at the input to the Bridge Rectifiers ?
Stu
I have 105ac 110ac 120ac at bridge. After 130dc 140dc 150dc.TO RUN a/b 150dc bias up,I CAN GET MORE POWER.But not needed,but I do own ESL all so. thanks My transformers R 1kva per winding.
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