kempy Posted February 9, 2015 Share Posted February 9, 2015 This will be a bit of a long burn project. This amp was an 845 SET ( Single Ended Triode) amp in working order, it belonged to a mate died a couple of years ago and was passed on to another mate. He decided that he wanted a well known local Tube amp builder to give it a bit of a tickle up and make it sound nicer, unfortunately he (the tube amp builder, who was another mate) died as well and my mate got it back in it's current state, mate. So as part of another purchase it was bundled in as part of the deal and here it sits and now as I review this I'm starting to think the amp is cursed. it's a fairly simple design but the tube amp builder (whom I think was a bit of a genius) added a bunch of new valve sockets and components and unfortunately all the plans went with him to the grave. I have a few ideas of my own though, firstly I want to increase the plate voltage from 700v to 1KV for a slightly higher output as I have read that 845's like to be driven at 1-1.2KV as well as sounding better. New Case, design to be decided. Review and possibly implement new driver stage. The 845 is a transmitter tube which looks fairly impressive when working, there are replacement chines tubes being manufactured now but I'd love to get my hands on some old stock RCA, General electric or other old varieties. RCA 845 Tubes I'm hunting for... The amp as it stands now Underneath 3 Quote Link to comment Share on other sites More sharing options...
governorsam Posted February 9, 2015 Share Posted February 9, 2015 I'll have a look in the shed tomorrow. Got a box of tubes still in their packets. Couple of dozen of them. Should probably just send them to you. 1 Quote Link to comment Share on other sites More sharing options...
governorsam Posted February 9, 2015 Share Posted February 9, 2015 Came with an old rca radiogram I brought years ago. From the Solomon Islands. Ex usa army type person had it. Might be too old? Quote Link to comment Share on other sites More sharing options...
kempy Posted February 9, 2015 Author Share Posted February 9, 2015 Hard to say without seeing them, certainly interested. Quote Link to comment Share on other sites More sharing options...
governorsam Posted February 11, 2015 Share Posted February 11, 2015 had a look, mine are way different. got a couple of 6l6g, 6j5, crc-6l6, and a jrc6h6. 2 Quote Link to comment Share on other sites More sharing options...
kempy Posted February 12, 2015 Author Share Posted February 12, 2015 Thanks for the pics, 6l6's are a good little output tube which I have quite a few myself, perhaps there's another OSer that could put them to use? Quote Link to comment Share on other sites More sharing options...
goblinboy26 Posted February 13, 2015 Share Posted February 13, 2015 interest to see if you get this up and running. Iv got an old 70's nz made 100 watt Rockit Valve amp which went bang a few months ago. looking at getting it repaired at somestage. Quote Link to comment Share on other sites More sharing options...
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