[Oregonian]

I tried the HFM adapter thing a couple of times and in my opinion it made a definite downgrade to the sound compared to straight out of the speaker taps. No question in my mind - tried it on two different systems with same results.

 

[SpeakerBox]

Close call yesterday. Turned on the Fisher 400 Receiver and no sound. Front panel lights on and output tubes glowing. No sound. This morning I opened it up and found a shorted 12AX7 in the preamp section. Had a spare and replaced. Up and running!

 

[DJtheAudiophile]

I know this isn’t a speaker thread, but this is a vintage item. Anyone know if the woofer can be fixed?

 

[SpeakerBox]

@DJtheAudiophile: It should be possible to have the woofer re-foamed. You might take the woofer out and get the model number and do some searches on line.

 

[Monsterzero]

Im no expert on repairing speakers,but I looked into repairing a pair of speakers that came with my house that are from the early 60's. I found places that sell the parts to do a refoam,and places that will do the repair for you as well.
I ended up not doing anything,and bought a pair of Rectilinear Highboys instead.

IIRC if resell value is important to you make sure to get a direct replacement for the woofer as using a 3rd party sub apparently makes the speaker less valuable to folks in the know.

 

[DRHamp]

This morning I opened it up and found a shorted 12AX7 in the preamp section. Had a spare and replaced. Up and running!

@SpeakerBox - what led you initially to the 12AX7?

 

[SpeakerBox]

@SpeakerBox - what led you initially to the 12AX7?

I put the unit on my bench with a DIM bulb tester. Fired it up and scanned all the tubes visually. Found one that was not lit up. On closer inspection the ring at the top had come loose and was contacting another part of the tube (short). Pulled and replaced and all was well. The DIM bulb tester is what alerted me to short. Bulb glowing bright.

 

[DRHamp]

I put the unit on my bench with a DIM bulb tester. Fired it up and scanned all the tubes visually. Found one that was not lit up. On closer inspection the ring at the top had come loose and was contacting another part of the tube (short). Pulled and replaced and all was well. The DIM bulb tester is what alerted me to short. Bulb glowing bright.

Ok, was just wondering how you isolated it to the tube -- thanks

 

[Skylab]

Parts Express both sells speaker re-foam kits, and also offers a service where they will do it for you (which is much more expensive because you have to ship the woofers both ways)

https://www.parts-express.com/cat/speaker-repair-parts/23

I refoamed the woofers in my Infinity Kappas myself, it took a whole evening but it did come out well. I had them do the woofers in my Pioneer DSS-9’s, though, because the cones are graphite and they can be fragile.

 

[SpeakerBox]

Ok, was just wondering how you isolated it to the tube -- thanks

DIM bulb testers are very handy. There is a thread in AK on how to make one.

 

[SpeakerBox]

Here is another piece of vintage gear I am working on. A Fisher Chadwick console:



This belonged to my father-in-law and currently has a broken power switch. Looking for a suitable replacement.

 

[DRHamp]

Here is another piece of vintage gear I am working on. A Fisher Chadwick console:

What amp is in it @SpeakerBox. Very nice console cabinet - wish I had room for one of the 60s Fisher Consoles. I think I read that this model came with a 660A amp - right?

 

[SpeakerBox]

What amp is in it @SpeakerBox. Very nice console cabinet - wish I had room for one of the 60s Fisher Consoles. I think I read that this model came with a 660A amp - right?

My recollection is that it is a 460, but need to recheck that. Eventually I will re-cap and re-tube the entire unit. Want to bring it back to its original glory.

 

[DRHamp]

My recollection is that it is a 460

A quick look at the output tubes should tell you -- I think the 460s were EL84/7189 and the 660s were 7591s but you probably knew all that.
again nice piece!

 

[SpeakerBox]

A quick look at the output tubes should tell you -- I think the 460s were EL84/7189 and the 660s were 7591s but you probably knew all that.
again nice piece!

Just checked - 460A.