I have PA-774 and Z-565 iron for a DIY ST35 build. I want to use transformer covers (for looks) and am a bit concerned about heat in the power transformer. One thought was to swap out EL84s for 6V6s, which would drop the heater load for 4 tubes by 840mA. What I read seems to say that these tubes perform identically, but the EL84 took over because it was more compact. Does this change seem wise? I plan on using the Gillespie EFB. Would I need to do anything beyond changing the bias point for the 6V6s?
3 posters
Build ST35 with 6V6 rather than EL84?
len42- Posts : 1
Join date : 2021-10-28
peterh- Posts : 1833
Join date : 2012-12-25
Location : gothenburg, sweden
6V6 is not identical to EL84. And power usage for ST35 & PA774 is no problem. Thus there islen42 wrote:I have PA-774 and Z-565 iron for a DIY ST35 build. I want to use transformer covers (for looks) and am a bit concerned about heat in the power transformer. One thought was to swap out EL84s for 6V6s, which would drop the heater load for 4 tubes by 840mA. What I read seems to say that these tubes perform identically, but the EL84 took over because it was more compact. Does this change seem wise? I plan on using the Gillespie EFB. Would I need to do anything beyond changing the bias point for the 6V6s?
( in my opinion) no reason to depart from ST35 "standard".
Last edited by peterh on Fri Oct 29, 2021 1:53 am; edited 1 time in total (Reason for editing : spelling)
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corndog71- Posts : 840
Join date : 2013-03-19
Location : It can get windy here
I’m with Peter and second his recommendation. Stick with the known circuit. Also, the power transformer is going to get hot. That’s just the nature of tube amps. You could always drill vent holes into the cover.
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