Re: [drakelist] TR-4 problems

[Gary Poland]

"Gary Poland" <[EMAIL PROTECTED]> made an utterence to the drakelist gang
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Matt,
 Does your TR-4 have a hard wired noise blanker...34NB? Your discription of 
the board in question sounds like part of the noise blanker.

Gary 

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[drakelist] TR-4 problems

[k1mcn-]

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 I have traced the mixer signals to a board next to to T6 and V3 the signal 
comes out of T6 into this board and then out of the board to V3 and V4. The 
board has two toridal inductors a trimmer capacitor and a fixed capacitor. The 
band switch shaft goes through a hole in this board.

The signal from T6 on my scope looks good and clean and in transmit X-CW mode I 
can see it vary with the transmit gain pot.
At the inputs to V3 and V4 the signal looks distorted and is fixed. I can't see 
that this should be a normal circuit reaction?
I also can't find the board or it's components on the schematic or photos for 
the TR-4 or TR-4C.

Is anyone familiar with this board and what it does and how it is suppose to 
work?

Matt
K1MCN/AFA1KM
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Re: [drakelist] Tr-4 problems

[Garey Barrell]

Garey Barrell <[EMAIL PROTECTED]> made an utterence to the drakelist gang
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Matt -
Does your TR-4 have separate USB and LSB filters or does it have the 
"soupcan" style filter?

73, Garey - K4OAH
Atlanta
Drake C-Line Service Manual


[EMAIL PROTECTED] wrote:
<[EMAIL PROTECTED]> made an utterence to the drakelist gang
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Hi all,
I picked up a TR-4 at a ham flea market for really short money. I was thinking 
of just keeping it for parts but it is all there physically and does work 
somewhat so I have decided to try to refurbish it. I have three problems with 
it. Two I assume are related and one that is separate. the first two are loss 
of receive sensitivity on all bands I can receive strong signals fine but there 
seems to be no band noise and of course weak signals are not there. When I say 
strong I mean s 10 or above on my other TR-4.
The second is the s meter is not working with respect to not being able to zero 
it and it will not indicate a received signal. With the meter zero control I 
was able to get the meter which seems to be working it?s self to between s 3 to 
s 5.
The third problem is that in SSB to get proper modulation I have to run the 
mike gain up about ? of the way using my Sure 444 D mike that works just fine 
on my other TR-4.
 

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Re: [drakelist] Tr-4 problems

[Garey Barrell]

Garey Barrell <[EMAIL PROTECTED]> made an utterence to the drakelist gang
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Ron -
We used "Pink Pearl" erasers, both wedge and draftsman's (you remember 
those, don't you?) electric erasers, primarily to remove the gold 
plating from solder pads on PC boards, at NASA back in the 60's.  The 
boards were cleaned with Freon TF (you remember that too, right?) 
afterwards before soldering.

I would never use an "ink" eraser, the ones with abrasive material 
included, on electronics.  Particularly on card edge connector pads.  I 
have seen cards with tin or gold plating removed down to bare copper 
with those things!

73, Garey - K4OAH
Atlanta
Drake C-Line Service Manual


Ron Wagner wrote:
Ron Wagner <[EMAIL PROTECTED]> made an utterence to the drakelist gang
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Is using an eraser to clean anything a good idea?  I though that most 
erasers has a sulfur in it and caused more corrosion?  Can someone set 
me straight on this?
73,
Ron


Visit my astronomy home page.   http://www.dma.org/~wagner
Amateur Radio Station: WD8SBB - Ron  and  KB8NRP - Joann


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Re: [drakelist] Tr-4 problems

[Ron Wagner]

Ron Wagner <[EMAIL PROTECTED]> made an utterence to the drakelist gang
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Is using an eraser to clean anything a good idea?  I though that most 
erasers has a sulfur in it and caused more corrosion?  Can someone set me 
straight on this?
73,
Ron


Visit my astronomy home page.   http://www.dma.org/~wagner
Amateur Radio Station: WD8SBB - Ron  and  KB8NRP - Joann

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[drakelist] Tr-4 problems

[k1mcn-]

<[EMAIL PROTECTED]> made an utterence to the drakelist gang
--
Hi all,

I picked up a TR-4 at a ham flea market for really short money. I was thinking 
of just keeping it for parts but it is all there physically and does work 
somewhat so I have decided to try to refurbish it. I have three problems with 
it. Two I assume are related and one that is separate. the first two are loss 
of receive sensitivity on all bands I can receive strong signals fine but there 
seems to be no band noise and of course weak signals are not there. When I say 
strong I mean s 10 or above on my other TR-4.
The second is the s meter is not working with respect to not being able to zero 
it and it will not indicate a received signal. With the meter zero control I 
was able to get the meter which seems to be working it?s self to between s 3 to 
s 5.
The third problem is that in SSB to get proper modulation I have to run the 
mike gain up about ? of the way using my Sure 444 D mike that works just fine 
on my other TR-4.

I have cleaned all of switches and pots very carefully spending most of a day 
on them burnishing them with a soft eraser and then with De Oxit and after that 
some Caig Labs lubricant. I also have pulled all of the tubes and used De Oxit 
on the pins and checked all of the tubes with a Hickock 800 tube tester. I 
replaced any tubes that were bad or questionable. 
I also checked the fuse lamp in final cage cleaning its socket and pins. I 
cleaned and tested the receive switch on the chassis as well. 
I powered the Tr-4 up with a AC-4 supply that has been refurbished and works 
well on one of my other Drake TR-4c?s.
I have not made any meter checks on the tubes to check biases. Yet but I am 
thinking that should be my next step.
Is there anything that I am missing here?

Transmit CW was low but now it?s putting about 250 watts out into my dummy load 
on 20 meters so I would really like to get this TR-4 up and running. It?s not a 
collector quality but for a on air rig it would be nice to refurbish it.

Thanks for any help,

Matt
K1MCN

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Re: [drakelist] TR-4 Problems

[Eric Webner]

Hello Vance,
 
I remember that the OA2 tube is a voltage regulator tube. Perhaps power supply voltages would be the first thing to look at.
 
If you are looking for someone professional to repair it, the following web page should be helpful. (This site should be helpful to writers of other recent posts who are looking for parts) http://www.wb4hfn.com/DrakeParts.htm
 
This is a great general Drake site, so after you find what you need, check out the other pages by hitting the Drake Home Page link. Kudos to Ron WB4HFN !!
 
73,
 
Eric KA8FAN
[EMAIL PROTECTED] wrote:


Hello,
 
I have a Drake TR-4 that I think I have ruined.
 
Some years ago, a friend at work gave me a TR-4 he bought brand new back in 77. However, he had stored it in his storage room and a mouse had built a nest in it.
 
Well I cleaned it up and it actually worked !
 
It would get kinda quirky sometimes. I tried to nutralize the finals one time and that's when my troubles began. It quickly went into self ocillation and burned a 470 ohm resistor going to T10. It had no audio or would not key up the relays. OA2 doesn't seem to light up anymore either.
 
I gave the radio to another friend who said he knew a guy who could fix it. Well, I got the radio back the other day. My friend never got it fixed.
 
I would really hate to trash this radio, it worked pretty good when it was working.
 
Anybody got any ideas where to start ?
 
Thanks
Vance
N5HNY
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[drakelist] TR-4 Problems

[Vanmor]

Hello,
 
I have a Drake TR-4 that I think I have ruined.
 
Some years ago, a friend at work gave me a TR-4 he bought brand new back in 
77. However, he had stored it in his storage room and a mouse had built a nest 
in it.
 
Well I cleaned it up and it actually worked !
 
It would get kinda quirky sometimes. I tried to nutralize the finals 
one time and that's when my troubles began. It quickly went into self ocillation 
and burned a 470 ohm resistor going to T10. It had no audio or would not key up 
the relays. OA2 doesn't seem to light up anymore either.
 
I gave the radio to another friend who said he knew a guy who could fix it. 
Well, I got the radio back the other day. My friend never got it fixed.
 
I would really hate to trash this radio, it worked pretty good when it was 
working.
 
Anybody got any ideas where to start ?
 
Thanks
Vance
N5HNY