#6201
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1) Suspect # 1 - the tubes. Do you have the right compliment of tubes in the right position? Are the tubes weak or not functioning properly? I'm not a fan of modern manufacture tubes, believing the quality is not as good as old US or Euro tubes. Unfortunately, it doesn't sound like you have any immediately available replacements. As far as a Klipsch Forte, I've owned Forte IIs, and IIRC, they are mid 90's as far as db/w/m and a 6V6'er should be able to drive them to well over 100db, so that shouldn't be a problem. 2) Suspect # 2 - Is the amp in the condition that it left the Inspire shop? Hard to tell without pix. As the 3rd owner, it's very possible that some hack has been in it and has messed with DJH's handiwork. I would recommend that you take high rez pix of the pieces from the top with and without tubes, and also flip both unit's over and take off the bottom cover and take some high rez pix of the circuitry. The sharper and clearer the pictures the better. Host them somewhere like Flickr and then post them here. Between Straitwire and myself we should be able to tell if someone's been in it. Be sure to unplug the units before removing the bottom plate and also take a pic of the bottom plate before unfastening it. If the fasteners are different, well, then you already have your answer....Personally, if you can return them, I would keep that as a last resort. However, buying used equipment is always a gamble if you can't diagnose and repair it yourself. You could always try Dennis again about a new manufacture CJ5 and an amp of your choice on Ebay. I know for a fact he has contacted the fellow on the last page who was looking for him.... Last edited by Analog Addict; 01-05-2021 at 03:56 PM. |
#6202
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My sincerest apologies and gratitude for allowing the post. I do not want to hijack this thread as it is full of so much good information.
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#6203
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Moderators: If there is a more appropriate place or method to continue this conversation, please let me know. I am extremely nervous about misusing the forum. |
#6204
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#6205
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I scrutinized the tubes when first installed, and did notice the 2 larger pins and oriented them correctly. They have been installed with the correct orientation all along. There is a red dot on the rectifier socket of both units and a sharpie dot on the LP-3a 80 rectifier tube but not on the tube in the 6v6'er. Thanks again. Photo's posted below: (tubes are in order of how they were placed in amps) I have more photos, these were reduced for the page. Thanks again all. Last edited by AMammal; 01-05-2021 at 09:31 PM. Reason: add photos |
#6206
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Rereading you troubles I have a few diagnostic suggestions. To start since you now are inside go ahead and get that 80 socket tightened up. If you have another preamp or amp try inserting the inspires in one at a time and see if you can detect the problem trending device. If you have a source with an output level control you can go strait to the amp as well. Just turn control down to start. Don’t want to send full volume to the speakers on startup. Since your troubles sound issues don’t seem to be channel specific I am guessing power supply issue and therefore rectifier (80) problem. If you can do as above try swapping 80s. Sometimes tubes get damaged during transit. Those 80s are vintage. Haven’t been made in many many years. And yes sometimes a tube can be bad and not register that on most tube testers. Anyway welcome to the Inspire family and to tubes in general. You jumped in with both feet. You might as well swim around for a while. Tubes gear does require a bit more active participation than SS. I have no doubt when you get these Inspires dialed in you will be happy you jumped. BTW, circuits look clean and orderly like from factory. Others here might see something amiss but I do not at cursory inspection. |
#6207
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I agree with bearcity, although it may help to post a full sized image of the pre amp to flickr in order to be able to fully examine the innards. The amp looks unmolested and I don't see any obvious component failure. Without a tester, here's what I would do with the rectifiers. Obviously, make sure both the pieces have been powered off and let sit for awhile, because you don't want any nasty surprises. Make sure they are unplugged before starting in.
1) Tighten the rectifier socket. This is the white ceramic socket with 4 triangular shaped contacts. I vastly prefer digging up old Amphenol 4 pin sockets for my purposes, but Dennis can't source these and regularly gives me $hit for my old recycled sockets. That being said, IMO the old sockets are made of superior materials and better constructed. Anyway, use a fine needle nose plier and gently squeeze the triangular shaped pin sockets from the underside. They should move closer together and grip the pins better. You should definitely notice a better grip on the tube. 2) Clean the contact surfaces. This can either be done with deoxit sprayed on the pins on one of the tubes and then the tube gently slid in and out of the socket in order to remove any potential oxidation. Another more decisive method of cleaning is to take a small round jewelers file and gently abrade the inside contact surfaces of the pin connectors. 3) Rather than have you test B+ voltages, I would grab pieces of your SS gear and test the pieces individually. Retube the pieces, and hook a SS amp up to the pre amp and listen. Hook a SS preamp up to the amp and listen. Any difference? Switch the rectifiers between the two pieces and listen again. Finally if everything sounds good, hook both Inspire pieces back together again and listen. See what you come up with.... Last edited by Analog Addict; 01-06-2021 at 01:56 PM. |
#6208
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Has anyone here run a pair of kt88s vertical bi-amped?
Last edited by TheHammsBear; 01-07-2021 at 11:59 PM. |
#6209
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Not vertical. I horizontally bi-amped my Proac DT8s with my PSE on the lows and 6V6er (with volume control) on the highs to great effect. Really made the Proacs come alive. Thought real hard about getting a second PSE and V bi-amping. Could not justify the setup and have since sold the Proacs. |
#6210
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