hyper Posted July 15, 2020 Share Posted July 15, 2020 13 minutes ago, mwhouston said: Yes it is and there are two tubes which were a gift from a fellow builder who knew I had completed a 807 SE UL amp with external PS:- https://retro-thermionic.blogspot.com/2012/03/luciano-807-power-amp.html These tubes, untested, have sat idle for many years. To keep the SC feel I wanted a power tube with a top cap. These freeby stunning looking 807 fit the bill. The 80 rec tube and RCA 6SN7 I have also had for donkeys and I have a pair of each. I have one 12A6 black metal tube I would like to build another SC wine box amp with. But need a good cct. I can use the same external Tranni brd. Looks like an interesting build never actually heard an 807 what do you liken them to??? 1 Link to comment Share on other sites More sharing options...
mwhouston Posted July 15, 2020 Share Posted July 15, 2020 (edited) I have built a number of triode amps but found SE UL amps had more punch even at two watts. But this was the Salt Cellar amp and had to have a top cap and triode strapped tube. It’s a veryimpressive looking tube. I download the tracks they listen to - Mississippi Fred McDowell the Allan Lowmax recordings. Single mic straight onto a tube tape recorder. On my main system this was sh!t and I could only bare half the tracks. After a warmup on the SC system I played the tracks which I up sample to 24/96 through a Pi server and Audiophonics DAC HAT. Three tracks had me very emotional and in tears. First time for a very long time. No deep bass but in your face raw reproduction. Get the picture. Edited July 15, 2020 by mwhouston 1 Link to comment Share on other sites More sharing options...
Steve M Posted July 15, 2020 Share Posted July 15, 2020 (edited) I’m listening to a 30yr old 807 valve amp at the moment, two output tubes per channel, push-pull topology and about 20w/ch ...sounds valvey, engaging, sweet and clear similar tone to an EL34, but maybe better? Cheers, Steve. Edited July 15, 2020 by Steve M 7 1 Link to comment Share on other sites More sharing options...
mwhouston Posted July 15, 2020 Share Posted July 15, 2020 25 minutes ago, Steve M said: I’m listening to a 30yr old 807 valve amp at the moment, two output tubes per channel, push-pull topology and about 20w/ch ...sounds valvey, engaging, sweet and clear similar tone to an EL34, but maybe better? Cheers, Steve. If they are that old get them tested. They could be “Good” but may not be. Amp looks super good. Link to comment Share on other sites More sharing options...
Steve M Posted July 16, 2020 Share Posted July 16, 2020 All good Mark, the amp has had a rebuild and check ups over its time, so working fine. It’s maker says it has some harmonic distortion purposely dialled in, to give it a luscious sound. Link to comment Share on other sites More sharing options...
betocool Posted July 16, 2020 Share Posted July 16, 2020 22 hours ago, Steve M said: I’m listening to a 30yr old 807 valve amp at the moment, two output tubes per channel, push-pull topology and about 20w/ch ...sounds valvey, engaging, sweet and clear similar tone to an EL34, but maybe better? Cheers, Steve. God I love those VU meters... or any meters of that kind. Nice toy! Cheers, Alberto 1 Link to comment Share on other sites More sharing options...
muon* Posted July 19, 2020 Share Posted July 19, 2020 (edited) Have had some 0.1uf Miflex copper wax caps bypassing the 1uf Andyn copper caps on the output of my cd player. Just disconnected the Miflex and it has remove some now evident smearing that was a result of having the Miflex across the Andyn's. Edit: sound stage is more correct too, previously with the miflex bypasses it was like two different ones with one over laying the other, so moving ya' head a little to left or right there were transitions. Should have tried the Andyn's on there own in the first place. Edited July 19, 2020 by muon* 1 Link to comment Share on other sites More sharing options...
mwhouston Posted July 21, 2020 Share Posted July 21, 2020 If you followed the Salt Cellar thread you may also find this of some interest. Link to comment Share on other sites More sharing options...
RankStranger Posted July 26, 2020 Share Posted July 26, 2020 I made some electricity out of some other electricity! 4 Link to comment Share on other sites More sharing options...
RoHo Posted July 26, 2020 Share Posted July 26, 2020 9 minutes ago, RankStranger said: I made some electricity out of some other electricity! Yeah, but you put in 240 electricities and you only got 16 out! 1 1 Link to comment Share on other sites More sharing options...
RankStranger Posted July 26, 2020 Share Posted July 26, 2020 14 minutes ago, RoHo said: Yeah, but you put in 240 electricities and you only got 16 out! gotta save some electricities for the rest of you 1 Link to comment Share on other sites More sharing options...
muon* Posted July 26, 2020 Share Posted July 26, 2020 Link to comment Share on other sites More sharing options...
mwhouston Posted July 30, 2020 Share Posted July 30, 2020 Whoever bought my Class D monoblocks - “Tutu” would please PM me. Link to comment Share on other sites More sharing options...
mwhouston Posted July 31, 2020 Share Posted July 31, 2020 I put Salt Cellar II on the CRO. Link to comment Share on other sites More sharing options...
betocool Posted July 31, 2020 Share Posted July 31, 2020 Hey Mark @mwhouston, what class D mono modules do you use? I'm looking for a pair of single ended mono class D modules and I was looking for the NCores, unfortunately they only have a differential input. Cheers, Alberto 1 Link to comment Share on other sites More sharing options...
mwhouston Posted July 31, 2020 Share Posted July 31, 2020 2 hours ago, betocool said: Hey Mark @mwhouston, what class D mono modules do you use? I'm looking for a pair of single ended mono class D modules and I was looking for the NCores, unfortunately they only have a differential input. Cheers, Alberto hifimediy 150W mono boards or 180W stereo brd. Cheap and very good. 1 Link to comment Share on other sites More sharing options...
Batty Posted August 1, 2020 Share Posted August 1, 2020 (edited) Deleted Edited August 1, 2020 by Batty deleted 1 Link to comment Share on other sites More sharing options...
mwhouston Posted August 1, 2020 Share Posted August 1, 2020 14 hours ago, mwhouston said: hifimediy 150W mono boards or 180W stereo brd. Cheap and very good. The 150W brds. “T3” Use a single rail DC supply. The 180W brds. “T4” require +/- or just a AC Tranni. The T4s have a high performance PS on brd. Also the T4s have full speaker crowbar protection built in.. Link to comment Share on other sites More sharing options...
betocool Posted August 1, 2020 Share Posted August 1, 2020 Thanks @mwhouston, I'm now considering 2x T3 Monos or 1x T4 stereo. I have a massive ~30V tranny and 47mF caps that I could use for the power supply, so that would work well. Just have to think about cap inrush current at switch on time. Cheers, Alberto Link to comment Share on other sites More sharing options...
mwhouston Posted August 2, 2020 Share Posted August 2, 2020 Put Sat Cellar 807 on the CRO. Here are the results. Similar power out but this amp sound more powerful. Link to comment Share on other sites More sharing options...
tuyen Posted August 3, 2020 Share Posted August 3, 2020 Some more photos of this diy speaker prototype designed by William Cowan from CowanAudio. I'm at the stage of playing around with the DSP (najda) to get the right xo/levels/eq. First taste of multientry horn and bipolar bass. Quite promising so far. 9 Link to comment Share on other sites More sharing options...
RankStranger Posted August 3, 2020 Share Posted August 3, 2020 23 minutes ago, tuyen said: Some more photos of this diy speaker prototype designed by William Cowan from CowanAudio. I'm at the stage of playing around with the DSP (najda) to get the right xo/levels/eq. First taste of multientry horn and bipolar bass. Quite promising so far. That looks amazing! How long until you have to return it to its home planet? 1 Link to comment Share on other sites More sharing options...
Rocketfrogs Posted August 3, 2020 Share Posted August 3, 2020 25 minutes ago, tuyen said: First taste of multientry horn and bipolar bass. Quite promising so far. That woofer arrangement looks intriguing. Link to comment Share on other sites More sharing options...
Pops110 Posted August 3, 2020 Share Posted August 3, 2020 25 minutes ago, tuyen said: Some more photos of this diy speaker prototype designed by William Cowan from CowanAudio. I'm at the stage of playing around with the DSP (najda) to get the right xo/levels/eq. First taste of multientry horn and bipolar bass. Quite promising so far. Looks good mate, might have to pop round for a listen and drop the attenuators back. 2 Link to comment Share on other sites More sharing options...
SumonKabir Posted August 8, 2020 Share Posted August 8, 2020 Finally DHT preamp is now complete 6 Link to comment Share on other sites More sharing options...
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