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You could probably make some money making those jigs. There are lots of people in the Polk Forum especially that would want one I would think.

That's a hybrid. Tube preamp and probably tuner, with a Solid state amp. The amplifiernis most likely the chassis in the lower right hand corner on the drawing. It has a row of output transistors it looks like right in the middle of the chassis. More than likely those transistors are early...

If thats true my guess would be the one with the 25us is European, or Canadian. I've run across several 112's and they didn't have the 25us printed on them. The asiest way to tell is the European versions may have a voltage selector on the back, or screw terminals inside to change it. I saw a...

If I had the patients, I would go through the whole thread and count the "upgraded Advent's. Then, when someone posted another, a number could be added to the post.

I like mine a lot. I have a pair of 10's that I rebuilt the crossovers in, glued the magnets, put dynamat on the spokes, and replaced the SL-2000 tweeters with RDO-194's. I like them also. The pair of 5jr's I have still have the SL-2000 tweeters, but they still sound good also. I have another...

Mine didn't come with grills I had to make some using P.E. grill kits. I left the original pegs in case I ever run across any of the originals.

Those must be really early. Nothing like mine with peerless tweeters. And I agree, it's too bad the serial number is missing.

+1

Was that tube close to the side of the chassis, or a transformer bell? Maybe there wasn't enough air space to disapate enough heat?

Or just ditch the socket all together. My VTA ST-70 has a bias trimmers for each output tube. So I added gest jacks where the sockets were. Including a ground socket. There are several ready to go test sockets I've seen for the Dynaco ST-70 that have just two test jacks that replace each socket.

Nice clean build. I was thi king of building one of these amps since I have a bag full of 6v6's and a few 6SN7's. But I'm going to build the 6L6 amp. It's more versatile when it comes to driver and power tubes. I built the Cascade universal preamp. It sounds a lot better than you think k it...

Put in backwards? I just don't understand why they load them the way they do to start with. I've seen 62k and 64k loading for MM carteidges in Chinese offerings of both tube and SS phono preamps. Why is it so difficult to just load them 47K?

I've done several woofers, a couple paper cone tweeters, and a few old 12" guitar speakers with Alinco magnets. It seems some.of those guitar speakers are well thought of. Over time the paper surrounds develope cracks. Once all these drivers were repaired, they worked fine and sounded great. It...

It's a dual purpose trunk. You can use it to move a dead body too!! :thumbsup: :music:

I had a pair of OLA's. I never had to take them apart though. Is the metal grill removable? If so, those rips are repairable if it still works.

I unscrewed the grill from the lattice frame. I think I may put new grill cloth on it and use it without the lattice frame. The factory cloth is faded, dirty and has a little missing at the bottom of the grill baffle. Plus it has a bunch of dimples in it from the lattice frame.

I keep everything that comes with the album inside the jacket. Even the digital download cards when present. Including any stickers that were on the factory outer sealed plastic cover. I had given an old record collection to one of my son's a few years back when he started to get into vinyl. One...

I had a couple lift off of the board in a Little Bear T-11 phono preamp I modified per Stephies mods. The phono preamp is my son's.

Even if there are a few small rips in the paper dome, it should still pass sound if good. Don't toss it.if it turns out it passes sound. You can use tissue paper and watered down Elmer's glue to repair it. Carefully brush some of the glue around the rip, then place the it of tissue, or coffee...

Be very careful with those solder pads. They tend to lift off very easily on these Chinese boards. I recently used a Chinese board to build a tube preamp. They sent the wrong 12v regulator. .5 amp instead of 5 amp. I had to buy a new one. One of the small solder pads lifted right off using a...

I access AK from my phone using a browser on the phone. Then just use the attach button and just drag my photos from the phone and post them. Easy peasy.

I've had tweeters that tested fine with a meter, yet made very little or no sound. If the voice coil is locked up without being shorted, they can test good with a meter. I do agree with going through the crossovers and cleaning the switch on the back with contact cleaner and working it back and...

Also, looking at the underside of the board, the solder pads that are between the two relays on either side look really close. I would look at those solder joints both top and bottom very closely. Whats between them, diodes?

Same here, itw been many years ago. Definitely 50+.

Alao look very closely for solder bridges on top of the board around the first two tubes. A few of those blobs of solder look awfully close to each other.