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Old 17th February 2011, 10:58 PM   #11
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Quote:
Originally Posted by woodturner-fran View Post
Interesting this.,.... I have a few of those valves here. Might be one to consider for a future project maybe.
It is gorgeous tube when triode connected. Sounds better than 2A3.
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Old 18th February 2011, 08:37 AM   #12
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Old 18th February 2011, 08:56 AM   #13
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Never heard of that tube, or direct heated penthodes altogether. Seems an interesting little bugger, thanks for bringing it to my attention
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Old 18th February 2011, 10:35 AM   #14
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Interesting looking little creature. But why the Gyrator on the first stages anode? Wouldn't a simple CCS have sufficed? What are the benefits of this?
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Old 18th February 2011, 10:43 AM   #15
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Kind of a similar question - could the front end of this be simplified somewhat to run a single b+ ?


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Old 18th February 2011, 10:53 AM   #16
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Hi Wavebourn,
The oversized PS is for minimising the ripple due to SE topology,right?
Any other reasons?
I use the same technik for better or worse, but I was searching for some more info on this.

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Old 18th February 2011, 04:09 PM   #17
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Quote:
Originally Posted by Alkis View Post
Hi Wavebourn,
The oversized PS is for minimising the ripple due to SE topology,right?
Any other reasons?
I use the same technik for better or worse, but I was searching for some more info on this.
Yes, also better stability on transients. The purpose of this toy was to explore all that is possible to get from this wonderful 4P1L tube.
Also, it would be theoretically better to power filament from 2.1V stabilizer connecting halves of filament in parallel.

Quote:
Originally Posted by woodturner-fran View Post
Kind of a similar question - could the front end of this be simplified somewhat to run a single b+ ?
Yes, you can use an interstage transformer and more powerful driver, like one more 4P1L. But such simplification would be more expensive.

Quote:
Originally Posted by Adolf Corkscrew View Post
Interesting looking little creature. But why the Gyrator on the first stages anode? Wouldn't a simple CCS have sufficed? What are the benefits of this?
Gyrator is actually a CCS with servo. In reality exact stable current is less significant than high dynamic resistance and stable anode voltage. When swapping tubes, and when they age, no need to adjust current supplied by CCS: Gyrator adjusts it for you.
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Old 23rd February 2011, 12:42 AM   #18
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I measured output power: it is 2.48W on 8 Ohm dummy load, 100 Hz. Tiny 6N16B-V performs well: 1'st grid peaks on 4P1L are +12V, while available negative bias supply limits the power.
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Old 23rd February 2011, 12:56 AM   #19
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Quote:
Originally Posted by Miniwatt View Post
Never heard of that tube, or direct heated penthodes altogether. Seems an interesting little bugger, thanks for bringing it to my attention
Telefunken designed again, for their German army... Captured from enemy by Red Army, then used for themselves in a bit different envelope. The story is similar to GU-50. Also, one more remarkable tube with similar fortune is 12P17L. Almost like 4P1L, but with more convenient 12.6V indirectly-heated cathode, and fully enclosed in aluminium shield.
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Old 23rd February 2011, 01:21 AM   #20
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Brilliant Edcor 25W 5K SE transformers: full power below 20 Hz. -3 dB point is on 26 KHz.
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