Hi all..
I picked up Eico HF-81 which has work done by NosValves decade back.. I did post about that earlier in one of the thread. I powered it up in variac at 40 volts and every 20 minutes stepped it up. I did not see the pilot light on even when i turned it on at 40. I slowly brought it up to 117 thinking the light will come up as voltage increases. So I checked the usual suspect and it had a blown 2 AMP Fuse. I changed it to 3 AMP fuse as suggested in service manual and powered it in variac. Again this one blew up too. I will upload the pics from the underside tomorrow. I did check the underside of the amp and I dont see any burnt or swollen resistors or caps.
As a last effort I want to bring it up in a DBT to check for the sake of it. Also Can I use a slow blow fuse instead of the Fastblow.
What should I do next to trouble shoot the issue.
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I picked up Eico HF-81 which has work done by NosValves decade back.. I did post about that earlier in one of the thread. I powered it up in variac at 40 volts and every 20 minutes stepped it up. I did not see the pilot light on even when i turned it on at 40. I slowly brought it up to 117 thinking the light will come up as voltage increases. So I checked the usual suspect and it had a blown 2 AMP Fuse. I changed it to 3 AMP fuse as suggested in service manual and powered it in variac. Again this one blew up too. I will upload the pics from the underside tomorrow. I did check the underside of the amp and I dont see any burnt or swollen resistors or caps.
As a last effort I want to bring it up in a DBT to check for the sake of it. Also Can I use a slow blow fuse instead of the Fastblow.
What should I do next to trouble shoot the issue.
View attachment 806386
View attachment 806388
View attachment 806387
View attachment 806389
View attachment 806391