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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+TL\-922\s+voltage\s+\/\s+bias\s*$/: 10 ]

Total 10 documents matching your query.

1. [Amps] TL-922 voltage / bias (score: 1)
Author: Tom Prohigh <tomp@prohigh.com>
Date: Fri, 12 Feb 2010 09:47:50 -0500
I have recently aquired a TL-922. It is on a stiff 240V line which actually measures 245V. No load voltage on CW is 2200 and on SSB is 3100. Under full load the CW drops to 1900V @ 600ma and the SSB
/archives//html/Amps/2010-02/msg00342.html (6,685 bytes)

2. Re: [Amps] TL-922 voltage / bias (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Fri, 12 Feb 2010 10:30:12 -0500
That idle current is fine for 1 tube and the voltage drop is excessive. Start by measuring the grid chokes for an open or looking for color on both plates. Carl KM1H _________________________________
/archives//html/Amps/2010-02/msg00345.html (9,035 bytes)

3. Re: [Amps] TL-922 voltage / bias (score: 1)
Author: Tom Prohigh <tomp@prohigh.com>
Date: Fri, 12 Feb 2010 10:34:40 -0500
There are 2 tubes in the TL-922. The grids are DIRECTLY connected to ground, I removed the caps and chokes and also put in a second ground wire from VC1. This eliminated some arcing/parasitics I was
/archives//html/Amps/2010-02/msg00346.html (9,855 bytes)

4. Re: [Amps] TL-922 voltage / bias (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Fri, 12 Feb 2010 10:38:09 -0500
Did you modify the bias circuit or check the voltage? Carl There are 2 tubes in the TL-922. The grids are DIRECTLY connected to ground, I removed the caps and chokes and also put in a second ground w
/archives//html/Amps/2010-02/msg00347.html (9,807 bytes)

5. Re: [Amps] TL-922 voltage / bias (score: 1)
Author: Tom Prohigh <tomp@prohigh.com>
Date: Fri, 12 Feb 2010 10:39:44 -0500
Only mod was V bias to R bias. At key down, there is 7.5V at the zener. Maybe I should do the diode bias or get a 5.1V zener, or maybe just the old tubes are a little soft ___________________________
/archives//html/Amps/2010-02/msg00348.html (10,994 bytes)

6. Re: [Amps] TL-922 voltage / bias (score: 1)
Author: TexasRF@aol.com
Date: Fri, 12 Feb 2010 10:40:13 EST
Tom, you mentioned having a stiff 240vac line. How stiff? What does it measure when the amplifier is maxed out in the SSB position at the 1000w level? 73, Gerald K5GW In a message dated 2/12/2010 9:3
/archives//html/Amps/2010-02/msg00349.html (10,168 bytes)

7. Re: [Amps] TL-922 voltage / bias (score: 1)
Author: TexasRF@aol.com
Date: Fri, 12 Feb 2010 10:46:18 EST
Tom, I am not familiar with the terms "v bias" and "r bias". Are saying the zener bias diodes have been replaced with resistors? 73, K5GW In a message dated 2/12/2010 9:40:18 A.M. Central Standard Ti
/archives//html/Amps/2010-02/msg00350.html (11,169 bytes)

8. Re: [Amps] TL-922 voltage / bias (score: 1)
Author: Tom Prohigh <tomp@prohigh.com>
Date: Fri, 12 Feb 2010 10:49:04 -0500
Converting a SB-220 or TL-922 from V-cutoff bias to R-cutoff bias: will prevent this from happening. The conversion: 1. Remove +110v from NC bias contact on relay without disconnecting the +110v lea
/archives//html/Amps/2010-02/msg00351.html (12,579 bytes)

9. Re: [Amps] TL-922 voltage / bias (score: 1)
Author: "Cecil Acuff" <chacuff@cableone.net>
Date: Fri, 12 Feb 2010 09:50:18 -0600
As I have always heard, this is not a legal limit amp so 700 watts out on CW and 1000 on SSB would be about right I would think. Are they consistently doing more than that? The few I've had through t
/archives//html/Amps/2010-02/msg00352.html (11,194 bytes)

10. Re: [Amps] TL-922 voltage / bias (score: 1)
Author: TexasRF@aol.com
Date: Fri, 12 Feb 2010 10:56:20 EST
Tom, that makes sense and sounds like a must do modification. I can't contribute anything to this discussion so will humbly bow out. 73, Gerald K5GW In a message dated 2/12/2010 9:49:21 A.M. Central
/archives//html/Amps/2010-02/msg00353.html (12,760 bytes)

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