[FredM]

Restoring a 41-295.  Every schematic I've seen has an 80 rectifier tube and the electrolytics in the pi filter are 18uF and 25uF.  However, the specimen I have has a 5Z3 rectifier tube and the filter electrolytics are 30uF and 12uF, which appear to be the original caps.  Is this a legitimate variation, or should I go back to the 80 tube to help preserve the transformer?  And any recommendations on which set of electrolytic filter caps to use?

[Brad Winder]

If the 5Z3 and filters look original, I'd say stay with those components and values.The discrepancy may be the result of a production line change. The other possibility is difference between console and table versions of the chassis.

[vinzer]

I would the 80 less strain on power transformer

[GarySP]

The 80 and 5Z3 are both full-wave rectifiers, and interchangable. The difference is the current draw and output. The 5Z3 is the 80 on steroids, but at a price. The 80 draws 2.0 amps to the heater, and the 5Z3 draws 5.0 amps. Considering that the transformer is already dealing with the higher line voltages today from when built do you really want to push the issue by using a 5Z3? If the schematics say 80, I, like Vinser above, would use the 80. Take care and BE HEALTHY! Gary