Derek92994's 700 Ser II White Oak conversion

Do you have one of those little powerpoint testers?
I checked my variac with one and found the active and neutral reversed.
I don't think that makes much difference tho'.
My first one had the earth and neutral reversed.
You gotta be careful with Chinese stuff.
Screen Shot 2021-03-20 at 2.01.09 pm.png
 
Last edited:
pennysdad said:
Do you have one of those little powerpoint testers?
I checked my variac with one and found the active and neutral reversed.
I don't think that makes much difference tho'.
My first one had the earth and neutral reversed.
You gotta be careful with Chinese stuff.
View attachment 49411
Click to expand...

Sure, I have one in the car, will run it.
 
Got some parts:

TO-92's
5 watt 100 ohm resistors
1 ohm 1/4 watt resistors
1/2 watt 30v zenerdiodes
 
Well, replace that TL 413's , then power up on the variac and check offset and bias,,,
 
Need instructions to check offset and bias, forgotten that stuff, has been a while
 
240, but start at zero and slowly through a DBT if you have one,,,
 
offset is checked at the speaker posts, bias is checked on the board..
 
That is not a TL 431, That's a 78L12...let me research that...
 
The 78L12 is:
12 volt 100ma
Input Voltage 14.5v
Voltage Drop 2.5v min
Regulator Polarity Positive

Edit its the only one they had, otherwise they had a 2.5 volt one which is nowhere near what we need
 
Make sure the 1 ohm resistors are 1 or 5% metal oxide (MO) or metal film (MF)...
 
And thanks for you help today bud, 50 minutes and we are done...
 
Just to recap:

I have the wrong to-92's, I will order TL431's and pico fuses from mouser, and touch base with Lee and Joe when they arrive, lock and load.
 
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