Bottlehead Kits > Paramount
Oops! Blown component on pcb
gsharri:
I have a pair of 300b Paramounts which were modified by Paul Birkeland to use a 6LU8 driver tube. I installed a pair of NOS 6LU8s and one of them was apparently damaged in shipping (tested good before shipping). The result: a flash of light and a "snapping" sound as D1 blew it's guts across the pcb mounted below the 6LU8 tube (see pic). What type of LED do I need for replacement and how do I test for proper operation? I have no schematics or manual as I purchased these used.
Thanks
Scott
Paul Birkeland:
Just replacing the LED is rarely sufficient to perform this kind of repair. Typically I would remove both LEDs (they are HLMP-6000), Q1, and Q2, then test R1 and R2 with the transistors removed to be sure they are still happy, then repopulate the board.
gsharri:
I will do that. Thank you sir.
gsharri:
What are the correct wattage ratings on R1 & R2 if they require replacing?
Thanks
Paul Birkeland:
R1 can be an 1/8W part. You'd want the 90.9 RN55D to get about the same part as what's there. R2 is a 300K 3W PR-03 resistor. If that's not available, the RR-03 is functionally about the same.
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