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Maniac
18
Oct 2, 2015
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MST3K_ServoLooks like 12AX7 and 6V6 version are the western replacement tube type...
With tube amps, especially ones with output transformers, two things matters the most:
Tubes: Swap in a good set of tubes can mean the difference of night and day. Kinda like the engine in your car.
Transformers: Everything goes through the transformer before it goes to your headphone/speaker... so kinda like your car's transmission.
That said, this is assuming the topology and setup is done correctly. (like the car's chassis).
With tube amps, especially ones with output transformers, two things matters the most:
Tubes: Swap in a good set of tubes can mean the difference of night and day. Kinda like the engine in your car.
Transformers: Everything goes through the transformer before it goes to your headphone/speaker... so kinda like your car's transmission.
That said, this is assuming the topology and setup is done correctly. (like the car's chassis).
Alfa24V
3
Feb 16, 2016
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MST3K_ServoI'm a bit late here, but someone on the Head-Fi forums talked to the manufacturer. They said the amp puts out 12.6V and 0.6A to the pre-amp tube. That means 6V-only tubes like the 6DJ8/6922 are not compatible. 12V-only tubes like the 12FQ7 and dual voltage tubes like the 12AX7 family and 12BH7 are compatible.
jewel942
1
Mar 27, 2016
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Alfa24VIf one wanted to use a 6v filament tube, it would be easy enough to pad down the filament voltage with an appropriate resistor. I recommend trying the E80CC or E180CC, both of which are excellent Philips 'special quality' tubes and fall more in line with the 12A_7 family operating parameters than the 6DJ8 types.
Alfa24V
3
Mar 28, 2016
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jewel942Actually, the 6DJ8 is pin-compatible. I am using a 8416 (rare 12v heater version of the 6DJ8/6922/E88CC/etc.) which has the same pin-out as the standard 6DJ8 and it works fine. Check out the pin connections at the bottom of these pages.
http://www.r-type.org/exhib/aaa0037.htm http://www.r-type.org/exhib/aag0108.htm
http://www.r-type.org/exhib/aaa0037.htm http://www.r-type.org/exhib/aag0108.htm
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