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Fuse Question regarding Olson tube receiver

Kingfisher

Kingfisher

Well-Known Member
Having recently scored an Olson RA-655 receiver. I found the fuse to be the wrong value. It's a 5A 250v fuse. Way too high for 4 X 6GW8's. Schematics for this receiver seem to be unobtainium so I have a lot of guess work. Wouldn't the correct fuse be closer to 2A?
 
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I don't know what that receiver uses but for tube receivers, there are around 2 to 3 amp slo blo.
 
I think a 2 amp fuse would be just about right. The tube integrated amps that size all draw about the same current from the wall. 2 amps will run the amp just fine, and open up if there is a problem.
 
Does it happen to have a wattage rating sticker? Divide that by 120 to get max used current, round up to the nearest reasonable size fuse. 2-3 amp is probably right on target tough.
 
2A slo-blo is about right. My Fisher 800C called for 3.2A, with an inrush limiter added it runs fine with 2.5A. Kenwood KW-30 and KW-33 (both p-p 6BM8s) used 2A fuse.
 
Tom Bavis said:
2A slo-blo is about right. My Fisher 800C called for 3.2A, with an inrush limiter added it runs fine with 2.5A. Kenwood KW-30 and KW-33 (both p-p 6BM8s) used 2A fuse.
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Yes I did see that on the KW-33 schematic. Also, the Pioneer SX-34 uses a 2A fuse as well. So I think I'll be going with a 2A slo-blo. 6BM8's are not the same as 6GW8's, but they are so similar, I can't see why it wouldn't be 2A.

Now I have to find a bayonet-base dial lamp. The original one is unmarked, but I suspect it is either 8volt 150mA or 8volt 300mA. Japanese manufacturers seem to have preferred 8-volt dial and panel lights.
 
gadget73 said:
Does it happen to have a wattage rating sticker? Divide that by 120 to get max used current, round up to the nearest reasonable size fuse. 2-3 amp is probably right on target tough.
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No stickers or anything on the back. No serial number. Even the metal nameplate is missing that gives the name, model, and company location (Akron, OH). I'm goin' with a 2A based on other Japanese 6BM8p-p receivers.
 
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