![]() I keep an inventory of a few dozen values on hand. And if order 'em, but decide you don't want to use them, you're only out a couple bucks. IMO/IME these Taiwan pots are NOT 'garbage'. You can get these Alpha-Taiwan pots from Ebay for almost nothing. ![]() But generally, they're a drop-in replacement. Sometime the knob sticks out 1mm or so more than the original. You lose that little metal bracket that the original might have - and those brackets are indeed used to support the PCB - But if you're only replacing a limited number of pots, I don't think it's an issue. But interestingly, there is ANOTHER "Alpha" potentiometer company out of Taiwan who make a physically-compatible device (Same PCB pin spacing, same size pot 17mm, same size shafts, etc.) I've used these to substitute into Fender PCB amps many times w/o serious issues. As mentioned, they're not going to sell you a single pot - You'd have to order probably 10k of them. Those pots are made by the American poteniometer company "Alpha", who is still in business. Pots that don't have a switch connected to them do not "need" to be replaced with the exact parts. I suggest clean the old solder off those and renew them to ensure future reliability. Not wholly uncommon for PCB-mounted power resistors. There's a couple power resistors, I think they're just about in the center of the board, that worked themselves loose due to thermal cycling. When I first got mine, it was operating intermittently. You don't wanna have to crack this back open again next year.Īlso. IMO, replace ANY AND ALL pots that are even beginning to show signs of wonkyness. Be sure of your abilities before you tackle it. That thing it a super pain to get in and out of. ![]() A Red Knob Twin is not the place to experiment and learn. I'm 50 with no symptoms yet - knock on wood.ĭunno how experienced you are with working on amps, but I'd be remiss not to say. Welcome to TGP Yes, people in this forum are pretty awesome. ![]() The owner let it sit in a shed for three decades.and now he wants it to work again. It is a nightmare trying to find pots for it.the charges per hour for that search would be considerable. I have a German built Kittyhawk amp, which is a Boogie clone from the ‘80’s, sitting here that needs all new pots.and those German-made pots are no longer available. With this newer amp, I have no idea how long it will take.”.I should have done the rebuild without bothering to look for a replacement part. Funny thing.when the owner dropped the amp off he said.”this won’t take long will it sinceit is a newer amp, right?” I had just run into a problem getting a pot for a solid state Fender from the ‘80’s, so I looked at him and replied: “If it was a vintage amp, I would have it for you tomorrow if you had to have it. I finally broke down and took a brand new push/pull with a different taper/value pot on it and took the switch mechanism apart to rebuild the original pot’s switch. One of the push/pull pots had a bad switch mechanism. Maybe do some of the suggestions mentioned in the article.I ran into this problem back in the late ‘90’s on one of these amps. I'll be pulling the schematic and checking components soon. Couldn't use the clean channel at a jam.The drive channel on the other hand is very loud.ĭo others have a similar issue? Some difference is one thing but this is a lot. My view may be somewhat skewed due to the problem with the clean channel. A few others have called it horrible but that has not been my experience. The drive channel sounds pretty good to me. Took me awhile to realize the expensive upgraded speaker had a problem. I had a Rivera Chubster with a Blue Alnico speaker. Loose tube, microphonic tube, loose speaker, wobbly shelf. This kind of speaker failure can creep up on you. Certain notes and volume would trigger the rattles. The speaker had been upgraded to a 60 watt Celestion Vintage 30 so it wasn't my first suspect. The one screw blocked by the transformer was about to fall out. The speaker screws were loose as suspected. The rattles turned out to be the speaker. I've got numerous tube amps, testers and tubes so I figured I should check it out. He said it was making some weird rattles. He has a couple Spark modeling amps and I knew this thing was just sitting around.
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