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The Old Tractor Forum / Miniapolise moline
« on: March 14, 2011, 08:41:26 AM »
This looks like mine
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17
CB Radio Repair Forum / The Cobra 29 Radio.
« on: January 18, 2011, 09:25:57 AM »
A walk through the receiver
18
CB Radio Repair Forum / STRANGE COBRA 2k
« on: November 03, 2010, 09:48:42 PM »
Cobra with some strange circuits
19
Home Brew And Tech Forum / Transformer re-wind
« on: October 26, 2010, 08:18:27 AM »
This is a big project. I have re-wound a bunch of smaller ones but this is the first big one.
This transformer measure 4x5x 3 inches deep. 120 volt primary with 900 volt secondary with a center tap.
This transformer measure 4x5x 3 inches deep. 120 volt primary with 900 volt secondary with a center tap.
20
Announcements / News about the site
« on: May 01, 2010, 09:40:16 PM »
ok, the bill has been payed for another year. I was going to let it go but decided to go ahead and take care of it. So we are here to stay and hope everyone enjoys
21
Vintage Ham Equipment / National 98 trash dump special
« on: March 12, 2010, 05:20:10 PM »
So what we have here is a National model 98 receiver.
This was a find at the trash dump. Luckily I save it from a horrible death.
The whole unit is intact and no parts missing.
Now to start the restore process.
This was a find at the trash dump. Luckily I save it from a horrible death.
The whole unit is intact and no parts missing.
Now to start the restore process.
22
Home Brew And Tech Forum / 700 watt homebrew dummy load
« on: March 07, 2010, 07:24:42 PM »
Today I needed another dummy load for the other repair bench.
Went to lowes and picked up a 1 quart paint can.
For this project you will need:
1-1 quart paint can
1 SO-239
2-1 inch by 4 inch copper circuit boards
14 680 ohm 5 watt carbon resistors
4 4-40x12 machine screws and 5 nuts
1 small terminal ring
1 quart mineral oil
A few inches of stiff hook up wire
silicon sealer
Mount SO-239 in top of paint can.
Tape the 2 circuit boards together and drill 14 even spaced holes to pass the resistor leads.
Install the 14 resistors in one side of circuit board. Copper side out. Leave about 1/8 of an inch between board and resistor. Cut leads and bend over. Solder all leads
Install other side same as previous.
At this time with an ohm meter check from one plate to the other. See how close to 50 ohms you are. If you need add or subtract resistors. With 14 installed mine was 50.7 ohms. This will depend on how close the tolerance of your resistors are.
Install the small ring terminal to one of the SO-239 mounting bolts pointing out. Bend it so it points away from lid.
Next cut 2 1 1/2 inches of stiff hook up wire. Solder one to the center of the SO-239 and the other to the terminal ring . Bend wire out and then down so it is the same OD as your resistor board.
Next mount resistor board as close to the lid as you can by soldering the two wire to it.
Insert in can and check SWR with a few watts. All should be good as this point.
Remove lid and seal the bottom of the SO-239 and the 4 mounting screws.
Take a break. You deserve it. Got to let silicone dry anyway.
Come back and fill can with mineral oil leaving about 3/4 inch from top.
Re-install lid and press in good
If you have 14 resistors installed you now have a dummy load that will handle 70 watts dry for short periods. I see know reason why it will not handle 700 watts in oil.
I will do the math later to figure out watt it will handle later unless someone else wants a stab at it.
Went to lowes and picked up a 1 quart paint can.
For this project you will need:
1-1 quart paint can
1 SO-239
2-1 inch by 4 inch copper circuit boards
14 680 ohm 5 watt carbon resistors
4 4-40x12 machine screws and 5 nuts
1 small terminal ring
1 quart mineral oil
A few inches of stiff hook up wire
silicon sealer
Mount SO-239 in top of paint can.
Tape the 2 circuit boards together and drill 14 even spaced holes to pass the resistor leads.
Install the 14 resistors in one side of circuit board. Copper side out. Leave about 1/8 of an inch between board and resistor. Cut leads and bend over. Solder all leads
Install other side same as previous.
At this time with an ohm meter check from one plate to the other. See how close to 50 ohms you are. If you need add or subtract resistors. With 14 installed mine was 50.7 ohms. This will depend on how close the tolerance of your resistors are.
Install the small ring terminal to one of the SO-239 mounting bolts pointing out. Bend it so it points away from lid.
Next cut 2 1 1/2 inches of stiff hook up wire. Solder one to the center of the SO-239 and the other to the terminal ring . Bend wire out and then down so it is the same OD as your resistor board.
Next mount resistor board as close to the lid as you can by soldering the two wire to it.
Insert in can and check SWR with a few watts. All should be good as this point.
Remove lid and seal the bottom of the SO-239 and the 4 mounting screws.
Take a break. You deserve it. Got to let silicone dry anyway.
Come back and fill can with mineral oil leaving about 3/4 inch from top.
Re-install lid and press in good
If you have 14 resistors installed you now have a dummy load that will handle 70 watts dry for short periods. I see know reason why it will not handle 700 watts in oil.
I will do the math later to figure out watt it will handle later unless someone else wants a stab at it.
23
Announcements / Dan Bittleston
« on: March 03, 2010, 07:48:06 PM »
Would had been 72 years old today.
Sure miss him.
May God rest his soul.
Sure miss him.
May God rest his soul.
24
Ham Radio Circuits and Repair / Heathkit Apache TX-1 restore
« on: January 24, 2010, 11:12:35 AM »
Here is my lastest project to restore.
This is a TX-1 transmitter from heathkit. Made in the late 50\'s.
This is a TX-1 transmitter from heathkit. Made in the late 50\'s.
25
Amplifiers / Johnson Viking Thunderbolt
« on: January 10, 2010, 06:56:02 PM »
Picked this up this week end
26
Gear Head / My brothers cars
« on: January 10, 2010, 06:24:03 PM »
These are some of Greg\'s cars
27
Home Brew And Tech Forum / Restore those metal can capacitors
« on: October 09, 2009, 04:21:46 PM »
You ever have them had to find metal can capacitors go bad?
Here is a solution I can up with years ago to keep the unit stock looking.
Cut the capacitor even at the base. This is where it steps from small to big.
Remove all the insides and tar around the bottom.
You will need 4 10uf at 450 volts.
In this case this is a 10uf times 4 at 450 volts.
Arange capacitors as shown in picture 2.
Solder all grounds together.
You can see how the capacitors fit right into the can.
In picture 3 solder the positive leads to pin base.
Picture 4 shows the ground in installed. These case are aluminum so you can not solder the ground to it. Simply drill a small hole near on of the base legs and run hook up wire through it. Solder to leg
Here is a solution I can up with years ago to keep the unit stock looking.
Cut the capacitor even at the base. This is where it steps from small to big.
Remove all the insides and tar around the bottom.
You will need 4 10uf at 450 volts.
In this case this is a 10uf times 4 at 450 volts.
Arange capacitors as shown in picture 2.
Solder all grounds together.
You can see how the capacitors fit right into the can.
In picture 3 solder the positive leads to pin base.
Picture 4 shows the ground in installed. These case are aluminum so you can not solder the ground to it. Simply drill a small hole near on of the base legs and run hook up wire through it. Solder to leg
28
Amplifiers / Dentron GLA-1000b Restore
« on: October 05, 2009, 08:20:53 PM »
Restoring a Dentrol GLA 1000B
All I can say is this one is a mess
All I can say is this one is a mess
29
Amplifiers / HF Amp Project with 811A tubes
« on: September 30, 2009, 06:13:24 PM »
This is the beginning of my HF amplifier .
It will use 811A tubes.
The chassis shown here will be stripped and repainted.
More to come
It will use 811A tubes.
The chassis shown here will be stripped and repainted.
More to come
30
Amplifiers / My amp projects
« on: October 05, 2008, 11:37:18 AM »
Her is a couple of amplifiers I picked up.
This one is a Dentron GLA1000b.
It was a dog!
But now it has been brought back from the dead and the beast lives.
It uses 4 6LQ6\'s. These thing are pricey!
There was a lot of work to do to this amp. The power switch was blown out. It is mounted behind the meter switch. I fabricated one and got that part working. Also the meter itself is bad. Have not found one yet.
This one is a Dentron GLA1000b.
It was a dog!
But now it has been brought back from the dead and the beast lives.
It uses 4 6LQ6\'s. These thing are pricey!
There was a lot of work to do to this amp. The power switch was blown out. It is mounted behind the meter switch. I fabricated one and got that part working. Also the meter itself is bad. Have not found one yet.