5F1 amp - can I substitute a 5U4 for the 5Y3?

[leevc5]

That's all, can I do it without damaging the PT?

 

[crusty philtrum]

Re: 5F1 amp - can I substitute a 5U4 for the 5Y3?

The 5U4 will draw 3 Amps of filament current, the 5Y3 draws only 2 Amps. So you need to know the rating of the 5 Volt winding on your power transformer, it may well be only rated for 2 Amps, in which case it is not a good idea. There's also the DC Voltage drop to consider.

http://www.300guitars.com/articles/rectifier-tube-voltage-drop-chart/

If it's an original Fender, I wouldn't even consider it unless I was going to install a new power transformer with the right spec's.

 

[jeremy]

Re: 5F1 amp - can I substitute a 5U4 for the 5Y3?

try a 5v4 if you want something a little hotter than a 5y3. same current draw and more power/less sag