Tram Titan tube dilemma!
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BigLion
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Tram Titan tube dilemma!
Ok I just cleaned up my Tram Titan and got it fired up. Have the schematic as well. But I noticed something. Tube V10, which the user manual and schematic state is a 6BR8, in its place in my Tram is a 12AT7! I looked under the chassis and nothing looks modified. Did Tram make some modification at some time? I got the 6BR8 tube, but the Tram does not work with it. Anyone out there can give some insight? Thanks.
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MDYoungblood
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Re: Tram Titan tube dilemma!
The Titan was made in 3 or 4 versions, which is it? To use that tube had to be modded but the good thing it worked, it has a 6v and 12v heater, (the first number on the tube is the voltage).
3's
Greg
3's
Greg
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BigLion
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Re: Tram Titan tube dilemma!
Hi Greg, it is the Tram Titan I, non-ssb model. It was not modded in any way as all the parts on the tub socket are original. Also, according to my Heathkit tube checker, the filament is 6.3volts.
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MDYoungblood Verified
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Re: Tram Titan tube dilemma!
Right, it is a standard 9 pin socket. It will work in both a 6v and 12v environment but it definitely is not a crossover tube for the 6BR8. I would leave it as it is a heftier tube than the original and add the change in your manual.
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Greg
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Greg
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Ga Tubeman
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Re: Tram Titan tube dilemma!
I am not looking at a schematic but possibly the only mod to the pins would be the linking of pins 4&5 and the other side of the 6 vt. heater connects to pin 9. I have a couple of Titan II's and I believe Tram used the chassis as one leg of the heater circuit. Possibly pins 4&5 are connected to + and pin 9 to ground. If this works and is the case I am glad to know this as I may convert some of the tubes in my Titan II radios to the more common 12Ax7 family.
The Titan II's also had variations. The modulator tube in the 1st one I got is a 6GK6 while the second radio has a more powerful 6GM5 in this position. I am wondering which one came first... the 6GM5 was also used in the Titan IV as the final... It is a hard to find tube ( for me) but luckily I found some converters to 6L6 ( on the way from China). The 6L6 is a much stouter tube and may be capable of higher output in the radio. I am looking forward to trying the converter sockets.
The Titan II's also had variations. The modulator tube in the 1st one I got is a 6GK6 while the second radio has a more powerful 6GM5 in this position. I am wondering which one came first... the 6GM5 was also used in the Titan IV as the final... It is a hard to find tube ( for me) but luckily I found some converters to 6L6 ( on the way from China). The 6L6 is a much stouter tube and may be capable of higher output in the radio. I am looking forward to trying the converter sockets.
