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Little Dot Tube Amps: Vacuum Tube Rolling Guide
Feb 15, 2014 at 10:58 AM Post #5,042 of 13,432
http://en.wikipedia.org/wiki/Russian_tube_designations
 
Feb 15, 2014 at 11:57 AM Post #5,044 of 13,432
royan said:
  Guys, do you know if Voshkod 6ZH1P-EV = 6J1P-EV? I'm looking for the real 6ZH1P-EV for a Little Dot MkIII.
 
I found this matched pair on ebay at a very good price:
http://www.ebay.com/itm/6ZH1P-EV-6J1P-EV-EF95-5AK5-Matched-pair-Mil-Tubes-TOP-/141184491953?pt=DE_TV_Video_Audio_Elektronenr%C3%B6hren_Valves&hash=item20df4061b1
 
But the seller says "6ZH1P-EV / 6J1P-EV" and I read several post in these forums where people doubt if 6ZH1P-EV = 6J1P-EV, so I'm confused.
 
There is another, pricier auction wich says 6ZH1P-EV only:
http://www.ebay.com/itm/301050973465?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
 
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Yes, they are the same. It just comes down to how the Russian cyrillic alphabet is translated into English. And to give you one more choice, I bought mine from this vendor:
 
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=130436695928&ssPageName=ADME:L:OC:US:3160
 
Feb 15, 2014 at 1:24 PM Post #5,045 of 13,432
Hello guys!

Just wanted to say that I ordered 2 octal and 2 loctal sockets, a black case, silver plated copper wire and 2 sylvania 6sn7gt black plate, bottom d getter and also 2 siemens c3g-s, so I am ready to build my adpater in a couple weeks!

What I need is some table or something showing me how to rewire the pins from 6n6p to 6sn7, do you have any clue where I could find this?

Thanks in advance, looking forward for some tube adapter magic :)

Edit:
Artsi, maybe you could help me, as you already built an adapter to use 6sn7 as power tube?
 
Feb 15, 2014 at 1:49 PM Post #5,046 of 13,432
collector13 said:
What I need is some table or something showing me how to rewire the pins from 6n6p to 6sn7, do you have any clue where I could find this?
Click to expand...

 
This would be a good time for you to learn how to read data sheets:
 
6N6P
 
http://tubes.ru/techinfo/HiFiAudio/6n6poc.html
 
6SN7
 
http://www.radiostation.ru/tubes/6SN7.pdf
 
The key is that the "basing diagram" or "lead diagram" is analogous to holding the tube upside down. That is, hold the tube in your hand, upside down and translate the pins from one tube to the other. However, you have to remember that you will insert the tube right side up. So when you diagram from one socket to the other, you will use the mirror image.
 
Have fun. :)
 
Feb 15, 2014 at 2:26 PM Post #5,047 of 13,432
gibosi said:
   
This would be a good time for you to learn how to read data sheets:
 
6N6P
 
http://tubes.ru/techinfo/HiFiAudio/6n6poc.html
 
6SN7
 
http://www.radiostation.ru/tubes/6SN7.pdf
 
The key is that the "basing diagram" or "lead diagram" is analogous to holding the tube upside down. That is, hold the tube in your hand, upside down and translate the pins from one tube to the other. However, you have to remember that you will insert the tube right side up. So when you diagram from one socket to the other, you will use the mirror image.
 
Have fun. :)
Click to expand...

Can 6SN7 be used as power tube without any power supplies?
 
Feb 15, 2014 at 8:13 PM Post #5,050 of 13,432
collector13 said:
Sorry for the stupid question, but is there any site explaining the letter abbreviations of tube diagrams?
Did not find any...
Or I am just not searching right...
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I suspect you are stymied by the 6N6P basing diagram. Yes, the Russian abbreviations appear to be a bit different. Typically, a = plate, g = grid, k = cathode, s = shield and f = heater. Here are two 6CG7 datasheets, which has the same pin-out as the 6N6P, to help you figure it out:
 
http://www.radiomuseum.org/tubes/tube_6cg7.html
 
http://www.drtube.com/datasheets/6cg7-ge1956.pdf
 
Feb 15, 2014 at 8:49 PM Post #5,051 of 13,432
Hi,
 
Can somebody clarify to me if I could used an external power supply rated 2A (3A peak) to supply two separate tubes at the same time. The combined heater draw would be less than 2A for the two tubes.
 
Next question: I have two bread boards, one set up for 6DJ8 tubes and the other for 12AX7/octal tubes w adapter. The heater connections are different for these two boards. Would there be any problem if I would connect my external PS to both boards with separate wires, but only use one board at a time? In other words, both boards would be connected to the PS, but only one tube would be plugged in at any given time. This way I would not have to switch wires when I change from one tube family to another.
 
Feb 15, 2014 at 10:33 PM Post #5,052 of 13,432
mordy said:
 
Can somebody clarify to me if I could used an external power supply rated 2A (3A peak) to supply two separate tubes at the same time. The combined heater draw would be less than 2A for the two tubes.
 
Next question: I have two bread boards, one set up for 6DJ8 tubes and the other for 12AX7/octal tubes w adapter. The heater connections are different for these two boards. Would there be any problem if I would connect my external PS to both boards with separate wires, but only use one board at a time? In other words, both boards would be connected to the PS, but only one tube would be plugged in at any given time. This way I would not have to switch wires when I change from one tube family to another.
Click to expand...

 
Someone other than myself will have to weigh in on the first question. But my thinking is that this would be a parallel connection, and so if the output from the regulator is set to 12.6V, then I think you could supply two 6.3V tubes. But again, my working knowledge is insufficient to say for sure....
 
And as long as you are using only one socket at a time, I can see no reason why you couldn't connect both sockets as you propose...  But here too, I hope someone else will weigh in.... :)
 
Feb 15, 2014 at 11:18 PM Post #5,053 of 13,432
mordy said:
  Hi,
 
Can somebody clarify to me if I could used an external power supply rated 2A (3A peak) to supply two separate tubes at the same time. The combined heater draw would be less than 2A for the two tubes.
 
Next question: I have two bread boards, one set up for 6DJ8 tubes and the other for 12AX7/octal tubes w adapter. The heater connections are different for these two boards. Would there be any problem if I would connect my external PS to both boards with separate wires, but only use one board at a time? In other words, both boards would be connected to the PS, but only one tube would be plugged in at any given time. This way I would not have to switch wires when I change from one tube family to another.
Click to expand...


Hey mordy
 
Here is a schematic of a tube amp that provides filament power to 5 tubes from the one 6.3V 3A transformer.

 
The transformer T3 provides High Voltage and Heater power.
They have on the 6.3V winding a Pilot Lamp PL1
Filament power to the 6X4 Rectifier Tube
Tube Filament V1 & V4 are 12AX7's in 6.3V mode using 4/5 & 9 as heater wires just like our adapters.
Tube Filament V2 is a 12AT7 in 6.3V mode
Tube Filament V3 is a 6AK5 native 6.3V filament.
 
So with a 3A supply they are powering all these filaments in parallel...
 
With your 2A supply you could power as many tubes as you want adding up the current draw of each tube. Don't forget that from cold, tubes will draw quite a bit more current than they rated at for a split second. If you are going to be powering 2 tubes that draw close to 2A, I would use at least a 3A supply to drive them. As they could draw close to 3 or 4 amps for a split second before warming up.
 
Running a 2A rated supply at it's max output is usually not a good thing, the regulator that provides your 2A will wear out quite a bit sooner than if it was a 3A version. A 5A supply would be ideal with lots of headroom for whatever you wanted to try.
beerchug.gif

 
Feb 15, 2014 at 11:21 PM Post #5,054 of 13,432
gibosi said:
   
And as long as you are using only one socket at a time, I can see no reason why you couldn't connect both sockets as you propose...  But here too, I hope someone else will weigh in.... :)
Click to expand...

Running the wires in parallel will cause no problem as long as you stay under the rated max output of your regulator or like gibosi says only use one socket at a time.
 
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