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Is there a lubricant you use for the pins and sockets?
Any recommendations on a good source to find replacement 6R7G/GT tubes? These seem relatively rare and I am having trouble finding spare tubes - much less ones that could be used to do tube rolling with...
As far as I know, Bendix never made a true 6X5. Bendix did make a tube labeled JAN-CEA-5852. This tube can be used in place of a 6x5, but it is not a true 6X5. The Bendix 5852 draws 1.2Amps. A regular 6X5 draws about half that current. You cannot just plug a 5852 in place of a 6X5. If you do, you may overload the filament transformer and burn it out. The filament transformer that is used in the current Mapletree PS2 is not rated to handle the current draw of the 5852. In some equipment you may be able to use a 5852 if you modify it to get at least 6-volts to the heater and you have a filament transformer that can handle the 1.2Amp current draw. I'm not an tube expert, but I know this from talking to Dr. Peppard. Let me also say that you haven't heard the full potential of your Mapletree preamps if you haven't used a Bendix 5852 instead of a 6X5. Let me explain. The first Mapletree power supply was the PS1. This was a solid state power supply-no tubes. The second power supply was a PS1T. This was a 6x5 rectified power supply. However, the filament section of the power transformer was rated at 2.5Amps. By changing one resistor to get 6-volts to the heater of the 5852, you can then use a 5852. The 5852 makes a large improvement in the sound of the Mapletree preamps. My preamp is a Line 2 SE but the same power supply works on all Mapletree preamps. The current PS2 uses two separate transformers-one for the high voltage and one for the filament voltage. The filament transformer is not rated high enough to handle a 5852. So do not plug a Bendix 5852 into your PS2. You won't get the proper heater voltage and you will overload the heater transformer. You may eventually burn out the filament transformer. You may have a 6X5 that is labeled Bendix, but it would have to be a regular 6X5 that someone labeled Bendix. It is not a true Bendix tube. I was able to modify my PS1T to use the Bendix 5852 by talking to Dr. Peppard. You might be able to modify your PS2 to use the 5852 if you could replace the filament transformer with one that is rated at 2Amps or more. You would need to ask the Dr. about this. I think this information is accurate. If not, please correct me. If Dr. Peppard reads this, please add any corrections or other information you feel is necessary.
the 6r7g is used in the phono circuit, yes?
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