Hello!DaveW wrote:Since reading this thread ref. Rory Gallaghers modified AC30 using EL83s in place of EL84s I have been tempted to try these. I have finally done so and am really impressed. I think they give a slightly emphasised mid range and break up very well. They are also very cheap: picked up NOS Teslas off eBay for a couple of pounds each. I have had these running for a few weeks now with no problems.
Original link to Rory's AC30
http://vintageamps.com/plexiboard/viewt" onclick="window.open(this.href);return false; ... 30#p795629
Just a bit of a wiring change, didn't need to change any component values. I have now fitted a small toggle switch in between the bases to allow me to fit either. Having the switch set to the wrong position doesn't seem to do any harm either, they just don't work.
If anybody else wants to try I have listed what I did here.
http://s59.photobucket.com/albums/g293/" onclick="window.open(this.href);return false; ... cture6.png
I ignored the screen connection on the EL83, would welcome any opinions on whether this is correct.
I have both 6P15P-er and EL83 tubes, and I want to try this. Sadly, that photobucket picture does not open. The figure would understand better how the connection is made. EL83 datasheet says that the maximum screen grid voltage would be 150 volts, while EL84 withstand 300 volts. Have had durability problems?