Philco 38-690 electronics restoration. - Printable Version

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+--- Thread: Philco 38-690 electronics restoration. (/showthread.php?tid=16528)

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RE: Philco 38-690 electronics restoration. - Ron Ramirez - 06-09-2017



See, I am still saying the same thing three years later! The facts do not change...

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RE: Philco 38-690 electronics restoration. - morzh - 06-09-2017

Ron


Oh, thanks. I found your post from 2014 and posted it, then saw your reply .

The only thing is, the original transformer has the fuse holder.

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RE: Philco 38-690 electronics restoration. - morzh - 06-10-2017

   

Can't catch a break.
As I also need the tweeters connected I took them off.
The cones aren't good. Though electrically both are ok. One is patched and one is warped - likely water.

Well, after the power-up with no sound......the interstage transformer is also shot. Also the primary. Open.
(More sighs here).

This is in addition to some  sipping under the vanity in the powder room and the Schrader valve from my rear passanger wheel having cone off together with the cap when I tried to check the pressure in it. No inflating that one.

When it rains, it pours, and the frogs get strangled.

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RE: Philco 38-690 electronics restoration. - morzh - 06-11-2017

Well, it's official: need to rewind two transformers.
The Output and the Interstage. Both have bad primaries.

I think I'll bother Heyboyer.

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RE: Philco 38-690 electronics restoration. - jcassity - 06-12-2017

is the PP xfrmr you mentioned earlier somewhat universal?

also, on your other transformers you are going to rewind,,, is your primary on the outside ?

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RE: Philco 38-690 electronics restoration. - morzh - 06-12-2017

Yes, it is universal - I even thought of yanking it out of the clam shell and trying to fit it into the original hardware (the mount holes are just 1/8" or so farther apart on it).

I am not sure about where the primary is on the interstage - it is fully encased and if I am to send it to Heyboyer, I'd rather they deal with it.

Member named Diverted rebuilt this one with Heyboyer in 2015.

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RE: Philco 38-690 electronics restoration. - morzh - 06-12-2017

So....roughly speaking I am looking at:

1. re-coning all speakers (one tweeter may be more or less ok but it does have repairs and then if one is reconed and the other is not then there will be differences in the acoustic characteristics between them) - $40/ea, then the woofer recone - $75, obviously with shipping, which promises to be significant (large woofer, at least 10lbs by itself) - $200 guesstimated total.
2. Two Heyboyer jobs, possibly $170 plus shipping, roughly $200 guessed total.

$400 or so in extra expenses.
Well.....I got this one cheap! For a reason, now that I know it

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RE: Philco 38-690 electronics restoration. - w4rtc - 06-12-2017

morzh
I have a interstage transformer from a 37-116, Philco part number 32-7057n. Would this work for you. It reads o k with a ohm meter.
Joe

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RE: Philco 38-690 electronics restoration. - morzh - 06-12-2017

Joe,

It is super-kind of you to offer me that.
If it did, I'd decline as I have two spare chassis for 37-116 and it is likely at least one of them is good

But sadly, no, it won't fit as 37-116 has a simple interstage to drive two 6B4 or 6A5 and no tweeter output winding.
Not only that but to drive 6L6 you need different turn ratio from 6B4 anyway, this is why even 37-116 and 38-116 transformers are not interchangeable

Thanks very much anyway.

Mike.

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RE: Philco 38-690 electronics restoration. - morzh - 06-13-2017

Shipped both transformers to Heyboer today.
We'll see how it goes from here.

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RE: Philco 38-690 electronics restoration. - jcassity - 06-14-2017

day late dollar short, found the transformers you needed from outside the forum.

Is it your intention to sell this radio when complete?

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RE: Philco 38-690 electronics restoration. - morzh - 06-14-2017

No...it is not. At least so far I do not sell the radios I restore.

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RE: Philco 38-690 electronics restoration. - morzh - 06-15-2017

Today will ship the speakers out. Put in in the trunk today, packed those speakers real well. Just the shipping is gonna cost me......

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RE: Philco 38-690 electronics restoration. - Kenneth F. Besso Jr. - 06-15-2017

the speakers----just Drive them down to Collingswood,,,not far 1 hour ride

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RE: Philco 38-690 electronics restoration. - morzh - 06-15-2017

I don't have that one hour during working days. And.....the total for the two boxes came out to $28. I will pay half that just for gas.
Plus 2.5 hrs of my time.

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