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Whitese,If I use just the TVC or the TVC in combination with Nick's buffer the sound is somewhat dull but this works OK for me.
Quote from: Jos on 9 Aug 2007, 07:29 amWhitese,If I use just the TVC or the TVC in combination with Nick's buffer the sound is somewhat dull but this works OK for me.Jos do you have the vCaps bypass capacitors? It might be worth trying if not, to open things up. I've also changed the capacitor in the power supply and the one in the pre-amp unit which is not bypassed, with Black Gates. Not that I doubt Nicks choice, just that I had some spare and I know them well. Also have a play with tube rolling the rectifier tube - this will change the sound of the buffer and can be used to fine tune your system. You could also change the 6n1p's, but if you get good ones they are pretty neutral, transparent and non-microphonic - so I'm tempted to use the power supply valve as a means to vary the sound. Having said that Rollo was using the 7308's - which are very nice and long life valve, (10,000 hrs), but expensive for good versions. Also, I've not checked the vplate voltage on the buffer, but the 7308 would die much more quickly if that is 200-220V - it prefers 100v. Perhaps Nick could help here and save me taking the buffer to bits again during it's burn in.I've got a pile of rectifier tubes, some NOS RCA brown base 5ar4's, NOS Phillips Miniwatt (GZ34), NOS Mazda 5Y3GB, some Sovtek 5ar4's and others. (What I don't have is the original 5Y3 as mine was broken on delivery - no problems - but my 5Y3GB is indirect heated so is a different valve. I'll try and get a normal 5Y3 as means of comparison.) I mean to test them out soon, just got to let the capacitors run in for some more hundred hours. As I guess I'd say the 5ar4's would give a bit more bass and treble - but I don't know for sure.
...I'm told that you can replace them with 6n1p's? Any comments....
6922 I think is a better 6DJ8 and I believe could be replaced with the 6n1p in a pre-amp.
here are some pics of the Single Ended 300B amp we are also launching on wednesdayShown here with my AVVT 32B