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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 1st May 2018, 04:07 PM   #11
Einric is offline Einric  United States
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I agree it was accidentally abusive.
I however, have to wonder if 70 years ago when power quality wasn't as good as it is now, if every time there was a brief power loss that a majority of people listening to music would lose their rectifiers....IDK.
I do use a milspec 5U4 in my SPP when I use my 6414's up front due to their lower plate voltage limits.

All that being said, I am happy with my "Seam Top" rectifiers.
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Old 1st May 2018, 04:48 PM   #12
GoatGuy is offline GoatGuy  United States
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Dunno… I've found outstanding results with solid state and a series resistor to “soften” the rectification toward what valve-diodes provide. For instance, 100 Ω, CRCRC gives –77 dB ripple floor at 3rd stage, with 47 μF, 100 μF and 220 μF sequence of capacitors. 250 VRMS, full-wave-bridge rectification, 60 Hz, not-too-soft a start. 90% of nominal output at 0.5 seconds. 99% in 2 seconds. Stage 1 isn't smooth enough in my mind for driving an output; stage 2 is at –53 dB ripple. And it works.

But when I'm really “doing it right”, I just use SS rectification and a MOSFET source follower (series regulation) for voltage stabilization / ripple elimination. Works like a charm, delivers –50 dB or more, like that. Using Zener gate reference, regardless of input line voltage variations, output is solid. Like a rock.

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John Curl's Golden Rule…: 100 kHz bandwidth, 3 μs risetime, 100 W mean output, 100 V/μs slew rate, 2 Ω dynamic load, 20 amp min current source/sink

Last edited by GoatGuy; 1st May 2018 at 05:02 PM.
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Old 12th June 2018, 05:40 PM   #13
michaeljessen is offline michaeljessen  Denmark
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I have bougt a 5AR4 matsushita nos on e-bay for 50$. for my SSE. I run it now about 50 hours. when I compare this tube with the Ganalex gold lion 5AR4 U77. (run also for about 50 hours) I hear a clearly acoustic improvement with the Genalex gold lion. It is more realistic, airy. better detail and voise in the mid. The bas is a litle less, but the bas sound more correct. I can especially hear this imprevement by playing LIVE IN CONCERT. f.eks. 10CC CLEVER CLOGS or live CD clasic music. There are a big difference in the tone by shwitching rectifier tube.
Maby I just like the Gold lion better, but I can just say try it in combination with Telefunken diamant button 12 AT7. I think The Gold lion sound far better.
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