[sdiy] type of lamp used in Fender Rhodes pre amp ?

[Peter Blackett]

Hi,
just wondered if anyone knew offhand what bulbs were used in the early 
version of the Fender Rhode pre amp for Tremolo ?
later preamps used I think a Vactrol.
I've mislaid my service manual for the Rhodes, and one online version I 
found doesn't have any schematics in it.....
the original fault was a smoothing cap on the pre amp had gone short 
circuit ! as the caps are probably 30 years old I'm going to change the 
similar electrolytic ones on the pre amp.
regards Peter