Magnavox 153B Hepplewhite.

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Re: Magnavox 153B Hepplewhite.

Post by Wildcat445 on Tue Dec 22, 2015 4:19 pm

Perhaps you saw this on "that other forum", 75....

http://www.antiqueradios.com/forums/viewtopic.php?f=15&t=290566

Nice cabinet, but no phono or FM adapter.

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Re: Magnavox 153B Hepplewhite.

Post by 75X11 on Tue Dec 22, 2015 5:12 pm

Nice looking. The other two here, the $200 hepplewhite and the $1500 windsor are still on the market too. My capacitors left Trenton last evening. Sal filled the order fast. (A shameless plug).
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Re: Magnavox 153B Hepplewhite.

Post by 75X11 on Tue Dec 22, 2015 5:43 pm

Here is what things are looking like so far.

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Re: Magnavox 153B Hepplewhite.

Post by Bill Cahill on Tue Dec 22, 2015 10:41 pm

That other drawer sticking out is where the phonograph mounted. It's missing. Cabinet is very similar to my 198C cabinet.

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Re: Magnavox 153B Hepplewhite.

Post by Wildcat445 on Wed Dec 23, 2015 9:20 pm

Looking good! Very Happy

Are all the resistors still good?

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Re: Magnavox 153B Hepplewhite.

Post by 75X11 on Wed Dec 23, 2015 9:27 pm

I have had to replace about 5 so far.
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Re: Magnavox 153B Hepplewhite.

Post by 75X11 on Thu Dec 24, 2015 1:11 am

I ordered the capacitors and cap tester on Saturday. The tracking on each say they are at the post office for delivery tomorrow. From New Jersey and California.
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Re: Magnavox 153B Hepplewhite.

Post by Bill Cahill on Thu Dec 24, 2015 1:31 am

Why are you doing part time work??? Replace ALL paper caps. Check resistors. Replace all electrolytics. It will never work correctly half way done.

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Re: Magnavox 153B Hepplewhite.

Post by 75X11 on Thu Dec 24, 2015 9:12 am

Read the whole thread, Bill. I am replacing all of them.
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Re: Magnavox 153B Hepplewhite.

Post by Bill Cahill on Thu Dec 24, 2015 12:07 pm

Good. Merry Christmas!!1 Very Happy

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Re: Magnavox 153B Hepplewhite.

Post by 75X11 on Thu Dec 24, 2015 2:41 pm

Now I hope the things to be delivered today don't get washed away. It was really bad driving to work today, water standing in all the roads. 2 Suburbans or whatever they call them now, crapped out ahead of me and put on their 4 ways and parked. Like a rock. Razz
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Re: Magnavox 153B Hepplewhite.

Post by Wildcat445 on Thu Dec 24, 2015 10:00 pm

Maybe they did not get the "find new roads" option when they bought their Suburbans. Very Happy

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Re: Magnavox 153B Hepplewhite.

Post by 75X11 on Thu Dec 24, 2015 10:09 pm

Just got home from work, everything was in the mailbox and dry.  Just tested out the capacitor tester.  All the removed capacitors, save 1 were .01uf.  There was supposed to be one of .04uf.  Funny thing the odd value was .04uf, but it was one with the same dot code as the others.  I think they got a deal on some war surplus components.  That tester is nice and for 15 bucks it will be nice to have something to check back on filthy waxy components.

http://www.ebay.com/itm/351410148553?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
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Re: Magnavox 153B Hepplewhite.

Post by 75X11 on Sun Dec 27, 2015 10:40 am

I've finished up the capacitors in the FM converter and have started on the receiver. This one is going to be a more difficult physical layout with tubular maximum wax caps. It also has some molded paper caps. What was supposed to be the reasoning in the use of the molded paper as opposed to the tubular spiral wound caps? I ask this in the event there was supposed to be other considerations such as RFI from the components in such an enclosure. I can see there were a couple of "polar" shielded tubular paper caps in the mix that there are no modern equivalents for, as far as their shielding qualities go. I have no alternative but to use the currently available components.
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Re: Magnavox 153B Hepplewhite.

Post by Wildcat445 on Sun Dec 27, 2015 1:47 pm

I made some "shielded" caps one time by wrapping my new caps in aluminum foil.  It seems to have worked okay.  I'm sure that is not the correct way to do it.  As long as I don't admit that on ARF I should be okay, though.  My Imperial and Concert Grand were loaded with Good-All molded capacitors.  They are just as susceptible to failure as good old wax caps.  They are still considered paper caps.  I am a huge Magnavox fan, but I am not a fan of some of the components they used.  Capacitors and resistors are always suspect when I work on a Magnavox instrument of any description.

I do not have a schematic for your Magnavox instrument. Would you be good enough to post a copy on here? That might give us a better idea of where the shielded cap goes and what its purpose is. I like to follow along with what you are doing. I will learn something. Very Happy

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Re: Magnavox 153B Hepplewhite.

Post by 75X11 on Sun Dec 27, 2015 3:38 pm

Sorry, I had thought I'd put up a reference. It is Riders vol.16, Magnavox Pg. 16-5 to 16-11. Though it's not a C it is still close in most ways.
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Re: Magnavox 153B Hepplewhite.

Post by Wildcat445 on Sun Dec 27, 2015 5:32 pm

I don't have my Riders here. IT is back home. Sad

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Re: Magnavox 153B Hepplewhite.

Post by Wildcat445 on Sun Dec 27, 2015 5:39 pm

I found a pic of the original capacitors in my Imperial amplifier.


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Re: Magnavox 153B Hepplewhite.

Post by 75X11 on Sun Dec 27, 2015 7:36 pm

Here is the layout and schematic.



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Re: Magnavox 153B Hepplewhite.

Post by Wildcat445 on Sun Dec 27, 2015 8:33 pm

That baby should be a robust performer! P-P 6L6 output and dual speakers. RF amplifier. I'm impressed. This is the first of the older, non-stereo ones I have seen.

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Re: Magnavox 153B Hepplewhite.

Post by Bill Cahill on Mon Dec 28, 2015 10:39 am

Wildcat445 wrote:I found a pic of the original capacitors in my Imperial amplifier.


Please tell me those white capacitors are not the new ones. They're paper.

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Re: Magnavox 153B Hepplewhite.

Post by 75X11 on Mon Dec 28, 2015 11:04 am

Keyword: Original. I'm sure they have been duly replaced.
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Re: Magnavox 153B Hepplewhite.

Post by Bill Cahill on Mon Dec 28, 2015 12:36 pm

Not original. Fifties replacements.
Didn't see "Keyword". Sorry.

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Re: Magnavox 153B Hepplewhite.

Post by Wildcat445 on Mon Dec 28, 2015 10:40 pm

They have been replaced. I wanted to show 75 an example of what mine had in the way of paper coupling caps.

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Re: Magnavox 153B Hepplewhite.

Post by 75X11 on Wed Dec 30, 2015 11:07 am

I completed the recap of the receiver last night. Also replaced a few resistors including the ones supporting the indicator tube. The molded paper capacitors were supporting the phono power output and one for the speaker circuit. I used a cutoff wheel to remove the electrolytic connections intact and did a little revising on the inclusion of the new elyts. I soldered their commons to the chassis and connected the other leads directly to their tie point except for the lead for the cathode followers of the output tubes. I removed the speaker deck last night. Two 12" field coil coaxial cone speakers. The next task is to do the patch. It would seem some urine laden beastie had residence in the speaker area of the cabinet. I have been saturating the unfinished wood areas with Odo-Ban and taking up the excess with a sponge.
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Re: Magnavox 153B Hepplewhite.

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