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RE: SS rectifiers for 5y3 types.

Before subbing any rectifiers there are a couple VERY important things to consider:

1. Voltage drop differs from one rectifier to the next. A change in rectifier type can significantly change the B+ voltage.

2. Different rectifiers have different limits on the size of the first filter cap (in a cap input filter). The 50-60 uf you may use with a 5AR4 may kill a 5R4 or 5V4.

3. The heater current draw varies significantly between some types. As has been mentioned, a 5U4 draws about 3 amps - that's 50% more than a 5AR4!

4. The warm up time is quite different between indirectly and directly heated types.

All those need to be considered before swapping rectos...

If you want a 5Y3 type with indirect heating get a 6087 or 6106. Both types are essentially indirectly heated 5Y3s. The 6087 isn't too pricey, but a 6106 Bendix "Red Bank" can be pretty steep these days.

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