Re: TL-922 tube filament voltage.
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Ohmite
offers bolt down fractional value resistors in metal casings of
10 and 25 Watt values.
For a single 3-500Z dropping 0.5 Volt at 15.5 Amp requires an 0.17 Ohm resistor and will dissipate 7.25 Watts of power.?
Bolt the down under the chassis near the base of the tubes.?
This will place the resistors in the cooling air blast for the tubes.?
Use one resistor for each tube.
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I have two Dale 0.02 ¦¸ 25 Watt sitting here in front of me that I ordered from Mouser.?
I plan to use them in two amplifiers that have a single 3CX1500A7 tube in them.?
I too have high mains voltages that I use a Fluke meter to read.
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73,
Dave, w6de
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From: [email protected]
<[email protected]> On Behalf Of Kim Herron via groups.io
Sent: 17 December, 2024 17:28
To: [email protected]
Subject: [ham-amplifiers] TL-922 tube filament voltage.
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I've appreciated all the info that I've gotten on the Kenwood TL-922A and I've ordered the relay switching board from Harbach.? While I'm in there, I'd like to address the filament voltage.? I've looked? for info on how I might do that,
but I'm not finding what I want.? Is there an easy way to do this that has been done and I can get the docs on??? Any info would be appreciated.? BTW, I've had my electrical service here upgraded and my line voltage here measures around 250 VAC.? So that filament
voltage SHOULD be addressed.
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