YES i meant 6L6, sorry…. and an amp with a pair of KT88 or 6550 will be in the 300ma range, maybe 350 including the preamp.

Hi al. The choke situation does not impact the need for a standby switch. rather, it is the presence of the rectifier tube that negates the absolute need for the standby, because it prevents the full B+ voltage from hitting the audio-tube plates before the tubes are heated up. As a general rule, if you use a solid-state rectifier, it’s a good idea to have (and use!) a standby switch.

The choke should be rated near (or higher than) the current draw of the audio-portion of the amp. If you don’t know how to figure this… you might wanna read up a little more. I can give u some general ballparks tho: a two-6V6 (or EL84) amp is about 100ma, two 6L6 (or EL34) is about 200ma, four 6L6 amp is about 400ma.

Good luck

c.

I noticed there isn’t a stand-by switch on the OR80 Build.
How critical are stand-by switches? Do chokes negate the need for one? Or are they not related in that sense.

How do you calculate how many mA a choke should be rated for? if you know the B+ voltage.

-al