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Post by MonkeyMan on May 12, 2017 15:48:52 GMT -5
Picked up a first gen Washington base today for $25. Powers up, and had transmit output very briefly, but quit. When keying on AM the relay clicks, as normal, but on SSB the relay chatters. I searched online and actually found a mention of the C179 cap right here on the forum. Apparently it could be the culprit, or at least one of them. My problem is that I can't find the darn thing. One post I read said back left of the board near the finals, but I'm not seeing it with these middle-aged eyeballs. Any guidance would be appreciated.  |
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Post by MonkeyMan on May 12, 2017 15:58:46 GMT -5
Found it! Little blue bugger, left front actually. Now to source a replacement...  |
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Post by 2600 on May 12, 2017 23:50:06 GMT -5
The little blue one, sure enough. Some folks just leave it off. Others have reported that a 2.2uf aluminum electrolytic works just as well. Should probably use one rated for 50 Volts if you use that type. We use a 35-Volt rated 2.2uf tantalum. The original one is rated for 25 Volts. Holds up just fine until the AM modulation gets turned up, then the higher audio voltage causes it to break down and short. The 35-Volt part holds up okay for us.
73
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Post by MonkeyMan on May 13, 2017 6:27:16 GMT -5
The little blue one, sure enough. Some folks just leave it off. Others have reported that a 2.2uf aluminum electrolytic works just as well. Should probably use one rated for 50 Volts if you use that type. We use a 35-Volt rated 2.2uf tantalum. The original one is rated for 25 Volts. Holds up just fine until the AM modulation gets turned up, then the higher audio voltage causes it to break down and short. The 35-Volt part holds up okay for us. 73 When you say some folks just leave it off, do you mean completely removed, or removed and jumped out? For me, removing it would be the best solution because I'm not sure my soldering skills (and tools) are up to the task. It's awful crowded on the underside of the board in that general area. |
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Post by KneeBiter on May 13, 2017 6:57:28 GMT -5
Just remove
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Post by MonkeyMan on May 13, 2017 8:05:41 GMT -5
Okay, c179 is out. I have nice output, approx. 10 watts, on SSB but nearly nothing on am.
Strangely, if I adjust the am power vr all the way down I get the most out of it based on what I'm hearing/seeing on a monitor radio. Finals?
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Sandbagger
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Post by Sandbagger on May 13, 2017 9:02:31 GMT -5
Okay, c179 is out. I have nice output, approx. 10 watts, on SSB but nearly nothing on am. Strangely, if I adjust the am power vr all the way down I get the most out of it based on what I'm hearing/seeing on a monitor radio. Finals? Probably NOT the final. The AM regulator (TR25) was probably cooked by the shorted capacitor. 10 watts on SSB is a bit low for that radio. With the ALC (CT7) adjusted for max, you should see closer to 20 watts PEP. It may need an alignment. But I'd measure the voltage going to the final (and driver). It should be close to 13.8V (assuming the power supply is set properly) on SSB. On AM it should be about 6V give or take, depending on where the AM power adjustment is set. If your voltage drops to near nothing, it's most likely that AM regulator transistor. |
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Post by MonkeyMan on May 13, 2017 10:35:30 GMT -5
Hmm, a bit above my skill set and level of motivation. I also noticed the big cap on the power supply board looks leaky and above it, on the inside of the cover, is some dark shmuzt, kinda looks like soot.
This one may end up going on the 'Bay.
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Sandbagger
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Post by Sandbagger on May 13, 2017 11:39:22 GMT -5
Hmm, a bit above my skill set and level of motivation. I also noticed the big cap on the power supply board looks leaky and above it, on the inside of the cover, is some dark shmuzt, kinda looks like soot. This one may end up going on the 'Bay. Maybe a trade opportunity?  |
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Post by KneeBiter on May 13, 2017 11:59:23 GMT -5
never mind the bay. sell it or trade it here  |
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Post by MonkeyMan on May 13, 2017 13:31:35 GMT -5
Hmm, a bit above my skill set and level of motivation. I also noticed the big cap on the power supply board looks leaky and above it, on the inside of the cover, is some dark shmuzt, kinda looks like soot. This one may end up going on the 'Bay. Maybe a trade opportunity? Possibly, it would certainly save me some trouble. |
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Post by MonkeyMan on May 13, 2017 13:44:36 GMT -5
It cleaned up rather nicely...   |
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Sandbagger
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Post by Sandbagger on May 13, 2017 14:57:06 GMT -5
Maybe a trade opportunity? Possibly, it would certainly save me some trouble. Well, knowing you like to collect vintage stereo receivers, I have a 70's vintage Pioneer unit that I haven't used in a number of years. It used to work, although I'm sure the pots are a bit scratchy by now. If that interests you, I'll dig it out and test it..... |
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Post by MonkeyMan on May 13, 2017 17:09:42 GMT -5
Possibly, it would certainly save me some trouble. Well, knowing you like to collect vintage stereo receivers, I have a 70's vintage Pioneer unit that I haven't used in a number of years. It used to work, although I'm sure the pots are a bit scratchy by now. If that interests you, I'll dig it out and test it..... You have my attention. Can you tell me the model number? |
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Sandbagger
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Post by Sandbagger on May 13, 2017 18:17:32 GMT -5
Well, knowing you like to collect vintage stereo receivers, I have a 70's vintage Pioneer unit that I haven't used in a number of years. It used to work, although I'm sure the pots are a bit scratchy by now. If that interests you, I'll dig it out and test it..... You have my attention. Can you tell me the model number? SX-434 |
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Post by MonkeyMan on May 13, 2017 20:41:43 GMT -5
You have my attention. Can you tell me the model number? SX-434 Little sibling to my SX 1050! Let's do it. Message me and we can meet at Stowe Turkey Hill again if that's convenient for you. |
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Sandbagger
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Post by Sandbagger on May 13, 2017 21:07:53 GMT -5
Little sibling to my SX 1050! Let's do it. Message me and we can meet at Stowe Turkey Hill again if that's convenient for you. Give me a chance to clean it up and test it first. It's been sitting in my basement and it's accumulated a bit of dust.... |
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Post by MonkeyMan on May 14, 2017 9:12:58 GMT -5
Little sibling to my SX 1050! Let's do it. Message me and we can meet at Stowe Turkey Hill again if that's convenient for you. Give me a chance to clean it up and test it first. It's been sitting in my basement and it's accumulated a bit of dust.... Okie doke. |
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Sandbagger
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Post by Sandbagger on May 14, 2017 12:06:27 GMT -5
Give me a chance to clean it up and test it first. It's been sitting in my basement and it's accumulated a bit of dust.... Okie doke. Well, wonders upon wonders, it cleaned up nicely and actually works! The volume pot has a few scratchy spots in it, but nothing too bad. Let me know when it's a good time for you to meet and swap. |
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Post by MonkeyMan on May 14, 2017 15:38:29 GMT -5
Well, wonders upon wonders, it cleaned up nicely and actually works! The volume pot has a few scratchy spots in it, but nothing too bad. Let me know when it's a good time for you to meet and swap. Approx. what time of day do you pass the Stowe exit on your way home? |
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Sandbagger
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Post by Sandbagger on May 14, 2017 15:45:17 GMT -5
Well, wonders upon wonders, it cleaned up nicely and actually works! The volume pot has a few scratchy spots in it, but nothing too bad. Let me know when it's a good time for you to meet and swap. Approx. what time of day do you pass the Stowe exit on your way home? Well, considering that I'm no longer working, I'm pretty much around during the day, and certain nights when we don't have softball games. |
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Post by MonkeyMan on May 14, 2017 19:37:38 GMT -5
Approx. what time of day do you pass the Stowe exit on your way home? Well, considering that I'm no longer working, I'm pretty much around during the day, and certain nights when we don't have softball games. Tomorrow? I work 2 minutes from the Turkey Hill in Stowe, and I usually go to lunch around 12:30-1:00, but I can go just about any time. And I'm done at 4:30. I'll put the radio in the car just in case... |
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Sandbagger
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Post by Sandbagger on May 14, 2017 21:35:40 GMT -5
Well, considering that I'm no longer working, I'm pretty much around during the day, and certain nights when we don't have softball games. Tomorrow? I work 2 minutes from the Turkey Hill in Stowe, and I usually go to lunch around 12:30-1:00, but I can go just about any time. And I'm done at 4:30. I'll put the radio in the car just in case... I can meet you there at 12:30-ish. That works perfectly. I'll see you tomorrow. |
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Post by MonkeyMan on May 15, 2017 7:34:43 GMT -5
Tomorrow? I work 2 minutes from the Turkey Hill in Stowe, and I usually go to lunch around 12:30-1:00, but I can go just about any time. And I'm done at 4:30. I'll put the radio in the car just in case... I can meet you there at 12:30-ish. That works perfectly. I'll see you tomorrow. Perfect, see you there around 12:35. BTW, the parking lot at Turkey Hill can get crazy around that time, so how about over in front of the dollar store (right next door), up close to High street? Think we met in that general location before. I'll be in my Pathfinder. |
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Sandbagger
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Post by Sandbagger on May 15, 2017 7:39:37 GMT -5
I can meet you there at 12:30-ish. That works perfectly. I'll see you tomorrow. Perfect, see you there around 12:35. BTW, the parking lot at Turkey Hill can get crazy around that time, so how about over in front of the dollar store (right next door), up close to High street? Think we met in that general location before. I'll be in my Pathfinder. I'll be there in the "mud duck" mobile. |
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Post by MonkeyMan on May 15, 2017 11:51:00 GMT -5
What's better than a trunk full of documents? A trunk full of vintage Pioneer...  |
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Sandbagger
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Post by Sandbagger on May 15, 2017 12:43:30 GMT -5
What's better than a trunk full of documents? A trunk full of vintage Pioneer... At least "ol zero-five" won't blow it up with a pack of firecrackers...... |
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Post by "Doc"Hammer on May 15, 2017 12:56:03 GMT -5
Damn nice lookin Pioneer! Well Dave, it looks like both of us ended up with nice radios this week-end..and MonkeyMan bringing the 'tunes! |
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Post by MonkeyMan on May 15, 2017 13:21:15 GMT -5
Damn nice lookin Pioneer! Well Dave, it looks like both of us ended up with nice radios this week-end..and MonkeyMan bringing the 'tunes! Ironically, a reasonably priced tuner or receiver is what I was hoping to find at the radio show, and in a roundabout way I guess I did. |
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Sandbagger
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Post by Sandbagger on May 15, 2017 14:07:21 GMT -5
Damn nice lookin Pioneer! Well Dave, it looks like both of us ended up with nice radios this week-end..and MonkeyMan bringing the 'tunes! Well, things happen for a reason, and it looks like we all got what we wanted. |
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