Bottlehead Kits > Kaiju Stereo 300B amp

Kaiju Failing Driver Testing [resolved]

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Roamconstant:
The A Board measures as follows:
IA= 512 VDC (fine)
OA= 298.7 VDC (fine)
Terminal 32U = 4.15 VDC- 8.99 VDC (depending adjustment of potentiometer).  (VERY LOW READING)

The D Board Measures as follows:
IA= 510 VDC (fine)
OA= 355.4 VDC (VERY HIGH READING)
Terminal 46U= 175.2 VDC (adjusted w/ potentiometer correctly).

One discrepancy I note from the instructions vs the parts list is the 0.1uf 630v metallized capacitors.  The parts list included 4 of these.
The manual calls for 0.1uf 400v film capacitors to be used on page 59, but these weren't included in the kit.  I used the 630v capacitors on the board instead, assuming this was the intent.

Anyone's eyes see my error here? 

Roamconstant:
Images

Roamconstant:
more images

Roamconstant:
Update: the low reading on 32 seems to be a bad connection.   Tilting the board corrects that problem.   I’ll find the weak spot there. 

However the oa reading of 354v is perplexing me.

Paul Joppa:
The 350v at OA is the Zener diode string, protecting the C4S from excessive voltages.

(The MJE5731A is rated 375v maximum. The Zener string has no other function, and is out of the circuit in normal operation.)

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