Electronics > Beginners

6V6GT vs 6GB6G

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ELS122:
is there any tone difference.
I think most likely cause it's a really different construction by the look

why?
cause 6GB6G's or the Russian 6P7S are really cheap
while the Russian equivalent of the 6V6GT is also pretty cheap (6P6S) I still would want to use the 6P7S's

and you can probably see where I got the question I'm asking, the model numbers are really similar so I got the thought that it might be really similar.


also while I'm on the topic of tubes the Russian 6N1P is the same as 12AU7 and 6N2P same as 12AX7?! is that right?
I think but I tried using a 6N1P in a 6N2P circuit and got no output, might just be that I was using used tubes that were sitting in an attic since the 80s

Gyro:
No idea on the first part.


--- Quote from: ELS122 on January 30, 2020, 01:11:04 am ---...
also while I'm on the topic of tubes the Russian 6N1P is the same as 12AU7 and 6N2P same as 12AX7?! is that right?
I think but I tried using a 6N1P in a 6N2P circuit and got no output, might just be that I was using used tubes that were sitting in an attic since the 80s

--- End quote ---

Yes, they are electrically similar. Compare the datasheet pinouts though - 12A*** have centre tapped 6.3/12.6V heater. 6N** are 6.3V heater, no centre tap (they provide a screen between the two triodes instead). That would be a good reason for them not working.

If buying 6n1P / 6n2p, then go for the -ev military spec versions from the Voskhod factory, they tend to have better element matching and lower distortion.


P.S. If looking for low cost output tubes for triode configuration, also consider the GU50. Very tough and twice the Anode dissipation of the 6P7S. No high voltage anode top cap to worry about. Note that they are 12.6V heater though and very specific socket.

gbaddeley:
6BG6B is similar to 6L6GT. This will have a different “tone” to 6V6GT, as the characteristics are different. AFAIK, 6V6 is an older lower powered tube.

ELS122:

--- Quote from: Gyro on January 30, 2020, 06:36:49 pm ---No idea on the first part.


--- Quote from: ELS122 on January 30, 2020, 01:11:04 am ---...
also while I'm on the topic of tubes the Russian 6N1P is the same as 12AU7 and 6N2P same as 12AX7?! is that right?
I think but I tried using a 6N1P in a 6N2P circuit and got no output, might just be that I was using used tubes that were sitting in an attic since the 80s

--- End quote ---

Yes, they are electrically similar. Compare the datasheet pinouts though - 12A*** have centre tapped 6.3/12.6V heater. 6N** are 6.3V heater, no centre tap (they provide a screen between the two triodes instead). That would be a good reason for them not working.

If buying 6n1P / 6n2p, then go for the -ev military spec versions from the Voskhod factory, they tend to have better element matching and lower distortion.


P.S. If looking for low-cost output tubes for triode configuration, also consider the GU50. Very tough and twice the Anode dissipation of the 6P7S. No high voltage anode top cap to worry about. Note that they are 12.6V heater though and very specific socket.

--- End quote ---
yes, I know that 12A** doesn't work in 6N*P circuits or vise versa without modifying some pinout on the socket.

also, I didn't say that I was gonna use power tubes in a triode config.

also, I am probably gonna use the 6GB6G's cause they look cool ;D and also they are a bit cheaper. but if I make a switch that connects the screen to the plate when I want to I can't put 700+ volts on the plate anymore  :(
but I guess if I have 350v on the screen and 700+v on the plate it will be really compressed anyway.


--- Quote from: gbaddeley on January 31, 2020, 05:37:23 am ---6BG6B is similar to 6L6GT. This will have a different “tone” to 6V6GT, as the characteristics are different. AFAIK, 6V6 is an older lower-powered tube.

--- End quote ---
oh, thanks!
if the 6GB6G is similar to a 6L6GC it will probably have more power output than using 6V6GT's.
also, I'm really confused about Plate dissipation and Power Output.
are those the same? I mean if I have a 30 watt dissapation and 2 tubes in push pull output will I have ~60watts of output?

also, is there any cheap Russian or any substitute for KT150 tubes?

edit: wait... GU50's are pentodes, not triodes!
I have considered them but it seems like too overkill for me, I just want something with less than ~60watts for now

gbaddeley:
Plate Dissipation is a physical limit. Power Output will be quoted with an operating class A, AB1, A2, push pull etc and usually a THD, eg 10%

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