Just noticed a problem with your BOM - the 100V 1W zener is underrated for the current it will be carrying, which is about 13mA, so 1.3W will be dissipated. The 75's are marginal as well. I'd suggest 4 x 56V and 1 x 27V to make the string out of 1W devices, or uprate the power rating.
good morning ,the one thing i would like to ask, i have 6v6 valves, pcl85 el34, 807, which of these has better audio performance, with better quality and fidelity / thankful.
I know this build was done and dusted almost 3 years ago, but was wondering: wouldn't sharing the 1st 6SN7 introduce some cross-talk between the L and R channels? I haven't browsed the hundreds of comments here, so forgive me if this was already discussed. Also, how would you measure this? Would feeding signal into only one input and measuring the opposing output do? TY!
i have supply tried a separate power . It cost a lot of money to do. Like the guy said I was then paranoid about the high voltage dc wire outside the chassis. I did not get any benefit that justified the price. I then converted back to an integrated chassis because I my worry.
Separation of PSUs from other actives is an everyday thing. Google the term "raceway." This may be one of those things where EEs who build stuff in the real world have a massive advantage. If it was a difficult thing, no aerospace application would exist. Audiophiles are the last people to ask about this topic. They just don't have the fundamentals down. They work on folklore. Find other sources.
the volume pot 100k linear or logic you didn't say. You could shield your Transformers by covering them with a tin box with lead lined inside to keep them on the same chassis what would give you the best of both worlds an even better if you can immerse them in oil as well
A similar project would be the RH Universal SE amp. It is simpler but uses plate to plate local feedback: rh-amps.blogspot.com/2013/05/rh-universal-v2-totally-universal.html?m=1 BTW, film caps in the PSU are totally worth it in most SE designs. Solens aren’t as good as the new DC Link types or even the Erse Pulse X caps. Just my humble experience.
If you start adding quality components, high grade tubes and transformers and on top of that spend a good amount of time on the chassis, the cost is easily several thousands $$$. Right and wrong does not exist, everything is subjective preferences.
Complete nonsense. Right is what a guy can afford. My lab has $250K of gear. So what? It means nothing. What matters is finding the exact point where a guy can get the build done. All your philosophy is junk.
Just noticed a problem with your BOM - the 100V 1W zener is underrated for the current it will be carrying, which is about 13mA, so 1.3W will be dissipated. The 75's are marginal as well. I'd suggest 4 x 56V and 1 x 27V to make the string out of 1W devices, or uprate the power rating.
You are correct, thank you so much for catching this.
Lundahl made in Sweden!
Sowter are superb, made in UK.
What would be good to find out which leg on a transistor is base and the other two.
Octal tube sockets. Why did you change the quantity on the bom from 4 to 3? 3 are required for the 3 6SN7s and 1 for the 5U4. Total = 4.
At 15:48 you change quantity of octal tube sockets from 4 to 3. Why? You need 4. 3 for 6SN7 and 1 for the 5U4.
I feel like your intro music should be in an internet cartoon... Big lez show? Red VS Blue??
good morning ,the one thing i would like to ask, i have 6v6 valves, pcl85 el34, 807, which of these has better audio performance, with better quality and fidelity / thankful.
I know this build was done and dusted almost 3 years ago, but was wondering: wouldn't sharing the 1st 6SN7 introduce some cross-talk between the L and R channels? I haven't browsed the hundreds of comments here, so forgive me if this was already discussed. Also, how would you measure this? Would feeding signal into only one input and measuring the opposing output do?
TY!
At 13 min. What do you mean “float the heaters”? Also how do you do that?
You need 4 octal tube sockets. 3 6SN7 plus 1 for 5U4 rectifier.
I probably missed it in this video, but where can I find a printable copy of BOM?
I'm not going to post the BOM until I've built it and worked out all the kinks.
i have supply tried a separate power . It cost a lot of money to do. Like the guy said I was then paranoid about the high voltage dc wire outside the chassis. I did not get any benefit that justified the price. I then converted back to an integrated chassis because I my worry.
Nice!
FYI Lundahl Transformers are not a UK company, they are Swedish.
Separation of PSUs from other actives is an everyday thing. Google the term "raceway." This may be one of those things where EEs who build stuff in the real world have a massive advantage. If it was a difficult thing, no aerospace application would exist. Audiophiles are the last people to ask about this topic. They just don't have the fundamentals down. They work on folklore. Find other sources.
Instead of using 3 6SN7 you can modify the circuit by using two 6SN7
the volume pot 100k linear or logic you didn't say. You could shield your Transformers by covering them with a tin box with lead lined inside to keep them on the same chassis what would give you the best of both worlds an even better if you can immerse them in oil as well
I think he mentioned in a previous video that he was using Log Pots for the volume ;)
tin and lead? and why? oil? LOL
Tin foil. Copper mesh. The old fish cans the CCCP used in their missiles. Ridiculous comment.
A similar project would be the RH Universal SE amp. It is simpler but uses plate to plate local feedback:
rh-amps.blogspot.com/2013/05/rh-universal-v2-totally-universal.html?m=1
BTW, film caps in the PSU are totally worth it in most SE designs. Solens aren’t as good as the new DC Link types or even the Erse Pulse X caps. Just my humble experience.
If you start adding quality components, high grade tubes and transformers and on top of that spend a good amount of time on the chassis, the cost is easily several thousands $$$. Right and wrong does not exist, everything is subjective preferences.
Complete nonsense. Right is what a guy can afford. My lab has $250K of gear. So what? It means nothing. What matters is finding the exact point where a guy can get the build done. All your philosophy is junk.