[drakelist] FS: Drake T-4XB Transmitter w/pics

2006-04-18 Thread RLucch2098 
Hi All;
Finally relocated to Port Charlotte Florida & started going thru my boxes of stuff.
I found a nice Drake T-4XB transmitter but I could'nt find the supply, maybe I sold it already?
This T-4XB will be untested but appears complete, all tubes, etc.
The chassis looks good also, little if no "spotting".
The only negative is that the cabinet must have been damaged in moving and the front lip is kinda bent a bit at the right front side. You can see it in the picture.
I don't have the time and have not found all my tools yet or I would have attempted to remove the cover & straighten it out.
I would like to get $170 shipped UPS.
Here are the pics:
http://www.myradioroom.com/t4xb-1.jpg
http://www.myradioroom.com/t4xb-2.jpg
http://www.myradioroom.com/t4xb-3.jpg
http://www.myradioroom.com/t4xb-4.jpg
Tnx & 73..
Rich WA2RQY/4

Re: [drakelist] AGC Fault Drake 2-C

2006-04-18 Thread francobevi francobevi 


"francobevi francobevi" <[EMAIL PROTECTED]> made an utterance to the drakelist 
gang
--
Garey,

I checked wiring and the contacts on S-3B. It seems they are making contact 
and in order! To be sure the muting plug was making a contact I directly 
grounded the muting plug inside the receiver.
All components seem good but the tube V1, which looks rather bad (it's a 
kind of dark inside) and does not heat very much compared to the other 
tubes. Could it be possible due to a fault in the tubes??


Another thing: I performed the "bulb test". I put in series a 60 watts bulb 
in the AC line and checked some equipment. Actually the Drake 2C seems to 
have some leakage somewhere. The bulb lights not just for a second or so 
but, although it dims, it has about the light of a candle. Diodes are 
original. I am going to replace the filter capacitors and in the case also 
the diodes with 1N4007 type to see if this makes any difference.


73s,

Frank



From: Garey Barrell <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
To: francobevi francobevi <[EMAIL PROTECTED]>
CC: drakelist@www.zerobeat.net
Subject: Re: [drakelist] AGC Fault Drake 2-C
Date: Sun, 16 Apr 2006 23:19:18 -0400


Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist 
gang

--
Frank -

I haven't worked on that many 2-Cs, but it sure sounds like either your 
MUTE shorting plug "isn't" or possibly the contacts on S-3B aren't making 
contact!   What you're seeing is exactly what I'd expect to see if the MUTE 
shorting plug was left out.  The S meter can drift around with the AGC off, 
and often moves upscale.


This must be the day for weird Drake problems with Rob's three apparently 
bad final tubes and your "non-shorting" MUTE plug!!


73, Garey - K4OAH
Atlanta

Drake B & C-Line Service CDs




francobevi francobevi wrote:


"francobevi francobevi" <[EMAIL PROTECTED]> made an utterance to the 
drakelist gang

--
Hi guys!

I am trying to repair the agc of a Drake 2-C.

First I notice that in standby the s-meter goes up S9+40, while setting 
the function switch to ON (or external muting with the muting plug) the 
s-meter goes to S1 but it moves up to about S5 with the AVC in OFF 
position when strong signal are heard (that's strange should it really 
move or stay fixed?? on strong signals distortion is heard). In AVC 
postion SLOW or FAST the S-Meter goes to S9+40 as in postion STANDBY and 
nothing is heard.


I measured the voltages at TP1: in position AVC OFF it is -1.35 Volts, and 
in position AVC SLOW or FAST it is something like between -15 Volts.


I was thinking that the wiring from the function switch to the AGC section 
could be wrong but before making any change I would like to know what you 
think it could be.


73, Frank

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[drakelist] Looking for Drake RV4C in nice condition!

2006-04-18 Thread Bill Maddock 
I  am looking for a nice Drake RV4C to compliment my TR4C. Anyone  have one they want to part with?     Thanks and 73,     Bill N4ZI
		How low will we go? Check out Yahoo! Messenger’s low  PC-to-Phone call rates.

RE: [drakelist] TR-4C transmitter troubleshooting

2006-04-18 Thread R. Ton 

"R. Ton" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
Alan,

Not much.  It swings from 255V in receive to 247V transmit.

I should have some NOS tubes on Thursday, so will know more then.

Thanks!

73, Rob (KFØRT)

> -Original Message-
> From: ALAN CHANDLER [mailto:[EMAIL PROTECTED]
> Sent: Monday, April 17, 2006 6:56 PM
> To: R. Ton
> Subject: Re: [drakelist] TR-4C transmitter troubleshooting
>
>
> Rob,
>
> Does the grid 1 voltage change when you go from receive to transmit?
>
> Alan
> - Original Message -
> From: "R. Ton" <[EMAIL PROTECTED]>
> To: "ALAN CHANDLER" <[EMAIL PROTECTED]>
> Sent: Sunday, April 16, 2006 5:58 PM
> Subject: RE: [drakelist] TR-4C transmitter troubleshooting
>
>
> > Hi Alan,
> >
> > Thanks for the message.
> >
> > It looks like I can adjust the AC-4's bias output from -43 to -76 volts.
> > The schematic shows -60.  I'm not seeing any cathode current anywhere
> > within the bias range of the supply.  Pretty strange...
> >
> > 73, Rob (KFØRT)
> >
> > > -Original Message-
> > > From: ALAN CHANDLER [mailto:[EMAIL PROTECTED]
> > > Sent: Sunday, April 16, 2006 6:45 PM
> > > To: R. Ton
> > > Subject: Re: [drakelist] TR-4C transmitter troubleshooting
> > >
> > >
> > > Hi Rob,
> > >
> > > Is the grid 1 voltage at -58 in transmit.  This sounds negative enough
> to
> > > bias the tubes past cutoff, i.e. no current.  Has the bias pot in
> > > the power
> > > supply been adjusted?  Most of the tubes that I remember need
> around -35
> > > volts  to draw the proper idle current.
> > >
> > > 73, Alan - K6RFK
> > > - Original Message -
> > > From: "R. Ton" <[EMAIL PROTECTED]>
> > > To: <[EMAIL PROTECTED]>
> > > Cc: "Drakelist" 
> > > Sent: Sunday, April 16, 2006 5:05 PM
> > > Subject: RE: [drakelist] TR-4C transmitter troubleshooting
> > >
> > >
> > > >
> > > > "R. Ton" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
> > > >
> --
> > > > Garey-
> > > >
> > > > It's sure looking like the tubes, odd as that seems.  Here
> > > > are the readings I'm getting (measured at the tube socket):
> > > >
> > > >   Pin 1 - 255VDC RX, 247VDC TX
> > > >   Pin 2 - -58 VDC
> > > >   Pin 3 - 155VDC RX, 0VDC TX
> > > >   Pin 4, 5 - Filaments (good - tubes light, get hot, RX works)
> > > >   Pin 6 - -58 VDC (Same as pin 2)
> > > >   Pin 7 - 255VDC RX, 247VDC TX  (Same as pin 1)
> > > >   Pin 8 - Ground
> > > >   Plate cap - 748VDC (+/- 1VDC, all 3)
> > > >
> > > > Definately agree that all three tubes would have to be open to
> > > > draw no current, but there doesn't seem to be another explanation.
> > > > It sure seems odd.  Almost impossible, even.  You would think
> > > > that opening the meter shunt resistor would actually protect
> > > > the tubes -- they were obviously drawing plenty of current
> > > > when the resistor blew.  Not knowing the history of this rig
> > > > though, it's hard to say.
> > > >
> > > > I pulled the tubes -- nothing obvious to be seen there.  The
> > > > above readings were taken after I put the tubes back in.  Wish
> > > > like heck I had a spare set to try, but I now have a set on
> > > > order.  (BTW -- I've never dealt with Antique Electronic
> > > > Supply - tubesandmore.com before, but if anyone's interested,
> > > > they have 6JB6A's on 'sale' for $14.60 apiece until 5/14 and
> > > > claim they'll match them for $1.25 apiece.)  A tube sale???
> > > >
> > > > So... unless someone sees something wierd with the voltage
> > > > readings, I guess I'm waiting on tubes.  Oh... also
> > > > checked the meter switch on the load control -- it ohms
> > > > out fine.  The factory selected resistor (R13) in this
> > > > rig is 39 ohms.
> > > >
> > > > Many thanks again!
> > > >
> > > > 73, Rob (KFØRT)
> > > >
> > > >
> > > >
> > > >
> > > > > -Original Message-
> > > > > From: Garey Barrell [mailto:[EMAIL PROTECTED]
> > > > > Sent: Sunday, April 16, 2006 4:45 PM
> > > > > To: R. Ton
> > > > > Cc: Drakelist
> > > > > Subject: Re: [drakelist] TR-4C transmitter troubleshooting
> > > > >
> > > > >
> > > > > Rob -
> > > > >
> > > > > I find it hard to believe that ALL three tubes are totally dead,
> > > > > assuming the filaments are lit!
> > > > >
> > > > > First, have you measured the screen voltage on the tubes?
>  Each tube
> > > > > should have about 250VDC on the screen pin via a 68 ohm, 1W
> resistor.
> > > > >
> > > > > Where are you measuring the plate voltage?  Measure at the
> > > plate cap of
> > > > > each tube.
> > > > >
> > > > > Again, if there is 750 VDC on the plate cap, 250 VDC on
> the screen,
> 0
> > > > > VDC on the grid and 0 VDC at the cathode, each one of those
> > > tubes would
> > > > > draw over an amp of cathode current.   To control this
> current, you
> > > > > apply a negative voltage to the grid, and typically ~ -55
> VDC should
> > > > > limit that current to