hpamdr's latest activity
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hpamdr replied to the thread Tube rolling thread | UltraSonic Studios.In a plain old standard design (cathode follower Push Pull) you can have ultra-linear/Triode switch done inside the amp. You MUST use... -
I have switched back to the triode mode with the 6bg6ga Sylvania and wow! Dunno if the 13d1 has burned in more or if the ultralinear...
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hpamdr replied to the thread Tube rolling thread | UltraSonic Studios.For the curious one, For those who like to look under skirts... This is inside my new amp, no printed pcb just testing ones to soldier...
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hpamdr replied to the thread Tube rolling thread | UltraSonic Studios.The old tubes used pure lead for soldering wire to the tube base. It could be difficult to remove old stuff without heating too much...
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hpamdr replied to the thread Tube rolling thread | UltraSonic Studios.For me it was the same with EL3N and FDD2 and i just concluded this was due to the socket/tube junction when you move/twist a bit the...
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hpamdr reacted to OctavianH's post in the thread Tube rolling thread | UltraSonic Studios with
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Switched back to RT 4654. These tubes gave me some headache today because one of them stopped working during operation. Well, after some... -
hpamdr replied to the thread Tube rolling thread | UltraSonic Studios.I would like have RFT :wink:, but it is just RSD. If i can get more info, i will try to run with 6M6 if not out of range to reduce...
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hpamdr replied to the thread Tube rolling thread | UltraSonic Studios.I got it without any information nor documentation.. I'm trying to get a bit more. I was able to open it and using what i see it is...
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hpamdr replied to the thread Tube rolling thread | UltraSonic Studios.Yes, it is build like a tank ! But what makes the impression of "being so big" is the placement of transformers in the side instead of...
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hpamdr replied to the thread Tube rolling thread | UltraSonic Studios.Got a new amp at home... Just a plain old design full of transformer CAP, and tubes 2 GZ34 + 2 6SL7GT + 2 x 2 EL34 Push Pull 20W.. Full...
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hpamdr reacted to OctavianH's post in the thread Tube rolling thread | UltraSonic Studios with Like.
E188CC dated ◿8D5. I've always neglected this tube. I have no idea why, I was blinded by 12AT7. Pairing with EL51 is very special, I...
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hpamdr reacted to LobalWarming's post in the thread Tube rolling thread | UltraSonic Studios with Like.
Not that hot compared to my Bendix 6080WBs with graphite plates. Their heaters can hit 218c on a cool day. My normal TS/RCA 6080s run...
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hpamdr replied to the thread Tube rolling thread | UltraSonic Studios.Thomas suggested to have a bigger bias range up to -30V to be able to use more penthode in input. It is less precise and i remember that...
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hpamdr reacted to OctavianH's post in the thread Tube rolling thread | UltraSonic Studios with Like.
I hear easily the difference between different input tubes, but it's true that the overall shape of the signature is given by the output...
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hpamdr replied to the thread Tube rolling thread | UltraSonic Studios.Your Odyssey is using "standard SET design". The synergy between driver and output is much more critical than with the Eternity using...
