Are these equivalent to anything you know of?

[elkym]

Wondering what the differences are between them and the 12at7 or 5751--
I can see some initial differences... like the filament current is rated at double the 12at7...

Any help?

GU17

Type
double beam tetrode

Cathode type
oxide,indirect heating

Application field
oscillation and power amplification up to 250MHz

Brief application

Amplification, oscillation

Envelope
miniature glass

Cooling method
air

Dimensions
80mmx22.5mm

Mass
25 g

Filament voltage
6.3 V

Filament current
0.72 - 0.88 A

normal anode voltage
200V

Mutual conductance
1.6 to 3.3 mA/V

Output power
12 W

Maximum anode voltage
400V

Maximum operating frequency
250MHz

[Le Basseur]

Possible substitutions (not verified,though):
GU17=6360= RS1023 = QQE03/12 = CV2798 = RS1029
Data here:
www.radiotechnika.hu/images/GU17.pdf
Interesting tube...I have it in my collection but I never cared too much as to put it at work.Looks like a newer "kid in town" from the long list of the (bigger) GU bros but I missed the 17's original intended use.
Regards,

[6267]

That is definitely nothing like the 12at7 or 5751. That looks like a power tube, not a preamp tube. I think the russian 12??7 equivalents are like 6n?p or something, there are substitution guides on the internet somewhere. The 12at7 triode sections were used in *tons* of other NOS tubes, so there are many tubes that contain for instance 1/2 6cg7 and 1/2 12at7, or 1/2 12at7 and a power pentode (6bm8). 6gn8 is like a super 12ax7 (half plate resistance, same gain) combined with a small signal pentode that could be used as a preamp or CCS. 12AZ7 is essentially the same as a 12at7, albeit with higher cathode-heater insulation.
Cheers.