Re: [Drakelist] L4B oddity

My question would now be (since you're assuming you'll have to drop a bunch of money on it anyway...) - what's the power out with it as it is, and how does it compare to how it was before you noticed the problem? Jim's right about the resistance: at 15A or thereabouts per filament @ 5V,

[Drakelist] Meter interchangeability

Folks - I see lots of TR-7 parts floating around the auction sites - including the S-meter. Are the guts of the TR-7 meter compatible with the 4-Twins? I'm just thinking ahead, in case I every have another close call where the meter doesn't survive! 73, Steve, W1ES/4

Re: [Drakelist] Meter interchangeability

Nope The TR-7 is ALL new. The R-4/T-4 meters are all the same basic movement. The S-Meter is the same from the 2-A through the R-4B. The PLATE meter is the same movement, but the early scale was 0-400 mA and the later ones, (early to mid T4-XB,) changed to 0-500 mA. The TC-2 meter is 0-400

[Drakelist] Drake T4B

I am thinning the herd as I sort of have a Pauli Exclusion Principle at work at this QTH--too many radios and not enough space --which means two radios can be in the same place at the same time. I have a T4B that I want to find a new home for and it can be seen in rigorous detail here

Re: [Drakelist] Meter interchangeability

Thanks, Garey. I suspected as much, but wanted to be sure the movements weren't the same. That R-4B I'm working on didn't fry the meter, but there's still something out of sorts with the bridge circuit, as I can't get the meter to zero when the AGC bus is adjusted to -1.35V. Looks like I'll

[Drakelist] T4B is sold

The T4B is gone. Thank you all who responded. 73's Pete N6QW___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist

[Drakelist] C-Line RTTY

I have been thinking about using my C-line for the RTTY contest this weekend. How do I set the transmit audio (gain) level. Do I set it the same as SSB where the peaks are about 150ma? I am not set up here for FSK, so its going to be a sound card affair. Any general advice for C-line RTTY?

[Drakelist] S-Meter Drift and PTO Nonlinearity

I'm trying to finish this R-4B - it's one of the ones that was extensively modified, and I've brought it back - mostly. You've heard that I had to replace a fixed resistor and a pot in the S-meter bridge circuit. After getting the S METER ZERO pot to its expected range, it seems that I have

Re: [Drakelist] C-Line RTTY

Bob, On RTTY, peaks are the same as average. It is continuous duty. I wouldn't run the T4XC much over 50W, with tubes as expensive as they are today if it were me. You have to make your own choice, but there is a BIG difference in the duty cycles of SSB and sound card RTTY. For sure I

Re: [Drakelist] C-Line RTTY

Hi Bob: I have done a few RTTY contests with the T4XA and B and run them much harder than that. FSK is fixed level, tonal without the type of peaks that make metering audio difficult. I run it as hard as the tune and CW levels for plate current. Garey and Don have a lot of experience with

Re: [Drakelist] C-Line RTTY

I got a DXCC-RTTY using my T-4XC with AFSK. I agree with this. I have a fan blowing upwards above the finals. You can run 75 watts because the contest messages are short. 73, Bob WW3QB Bob, On RTTY, peaks are the same as average.  It is continuous duty.  I

Re: [Drakelist] C-Line RTTY

Hi Donwelll...ya shot my lights out. :) I think you are correct if I were doing long-winded RTTY ragchews like we have done in the past. But the duty cycle is VERY short for RTTY contesting and (I'm guessing here, less than 50%. I also run a very good fan. The T4's ran very cool

Re: [Drakelist] R4C Sherwood mods

Yeah, but Klinger had more style... Steve Wedge, W1ES/4 I can't complain, but sometimes I still do. - Joe Walsh If the above message appears, it came from Steve's Son of Laptop! - Original Message - From: Jim Shorney jshor...@inebraska.com To: drakelist@zerobeat.net Sent: Saturday,

Re: [Drakelist] R4C Sherwood mods

On Wed, 4 Jan 2012 21:18:49 -0500, Steve Wedge wrote: Yeah, but Klinger had more style... Ah, but Klinger stopped wearing dresses when he became company clerk. 73 -Jim (not a cross-dresser, just a modder) -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B,

Re: [Drakelist] C-Line RTTY

Bob - The C-Line does fine for RTTY. The transmitter has a jack on the back panel marked RTTY that when shorted shifts the carrier a bit to ensure that both tones (2125 - 2975 Hz 850 Hz shift,)were passed through the LSB filter unattenuated. It was originally designed when we were still

Re: [Drakelist] S-Meter Drift and PTO Nonlinearity

Steve - Don't forget that the S-Meter is a bridge that compares the current drawn by V2 and V3 with that drawn by V4 and V5. So anything that alters these two currents _differently_ can cause what you are seeing, usually 'weak' tubes. Of course ZERO drift is usually caused by gassy tubes,