6h8c
Ive had quite a number of these valves, Great performer, low microphonicy, nice sounding Most of mine made by Reflector--seems they are the most popular 6h8c (6SN7) The specifications are just very slightly different but so close as to make no difference.
The 6h9c (6SL7) is also a great valve, again low microphony and good sounding, the specs are identical to the 6SL7.
Ive had quite a number of these valves, Great performer, low microphonicy, nice sounding Most of mine made by Reflector--seems they are the most popular 6h8c (6SN7) The specifications are just very slightly different but so close as to make no difference.
The 6h9c (6SL7) is also a great valve, again low microphony and good sounding, the specs are identical to the 6SL7.
quote:
Originally posted by burnedfingers
They are by far the best sounding tubes I have heard in the 6SN7 family. They are even better than my 5692's. Well worth the money.
What other 6SN7GT family did you listen to?
jacques
jacques let me restate that. I have listened to about every 6sn7 make there is. The 1578 is a damn good sounding tube.
Originally posted by burnedfingers
They are by far the best sounding tubes I have heard in the 6SN7 family. They are even better than my 5692's. Well worth the money.
What other 6SN7GT family did you listen to?
jacques
jacques let me restate that. I have listened to about every 6sn7 make there is. The 1578 is a damn good sounding tube.
I do, accidentally.
OTK label means an ordinary QC, i.e. Отдел Технического Контроля that exists on any enterprise. Rhombus or a star with a letter in it means Приёмка Представителя Заказчика, i.e. Defence Ministry QC.
What is so special in metal base and holes?
By the way, recently prices on 6N1P on ePay dropped down drammatically, and I see a lot of 6N1P-VE for sale. What is suspicious, I don't remember VE designation, usually they were marked EV. Also, both OTK and rhombus are stamped at once, very precisely as if by some fine printer. It is strange as well, because such stamps were printed manually by the person that tested them, using his/her personal number.
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Here is some spec of 6N8S / 1578 tubes:
Application: LF voltage amplification
Cathode type: oxide,indirect heating
Envelope: glass
Filament voltage,V: 6,3
Filament current,A: 0,55-0,65
Anode voltage,V: 250
Anode current,A: 0,0055-0,0115
Anode power,W: 2,75
Grid1 voltage,V: minus 8
Steepness,mA/V: 2,1-3,1
Reverse grid current,uA: 2
Microphnic noise,mV: 150
Gain: 18,0-23,0
Socket type: rsh5-1
I know it's the best version of 6N8S / 1578 tubes and this version made special for Russian military and a longer time of work.
If you're looking on eBay item you can see both.
Without holes
With holes
Buyer's which interested in my 6N8S also ask me : Does it not 6N8P version of this tube. link to ebay serach. Yeah it's look like a 6N8S in metal base. But there are a poorest quality and so cheap.
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