EH Scott Radio Enthusiasts

The Fine Things are Always Hand Made

William David Howard
  • Male
  • Coupland, TX
  • United States
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William David Howard's Discussions

Philly Power Transformer

Started this discussion. Last reply by William David Howard May 28. 10 Replies

I built a light bulb test jig supplied through a Variac to protect my Philly's power supply while I get the PS/Amp checked out.  I notice that with the rectifiers removed and no load on the filament…Continue

Which Philly do I have?

Started this discussion. Last reply by William David Howard Apr 8. 4 Replies

On April 5th I was given a Philharmonic chassis set to resurrect.  I didn't say restore, because the chromed steel may be too rusty to restore without stripping and rebuilding everything.  After…Continue

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Latest Activity

William David Howard replied to William David Howard's discussion Philly Power Transformer
"Thanks David.  I did know what you meant since you mentioned you had B+.  At power-up, the filament circuit has a pretty low resistance with all 30 tubes heating up.  Our severe weather has abated, so I'm trying the heating…"
May 28
David C. Poland replied to William David Howard's discussion Philly Power Transformer
"I forgot to clarify, powering with all tubes after reaping, the lamp immediately goes rather bright and dims as the B+ voltage builds, and still glows until I throw a switch to bypass the floor lamp. Before you decide your power transformer is bad,…"
May 28
William David Howard replied to William David Howard's discussion Philly Power Transformer
"Thanks, Mike.  I'll do a heat test later this evening.  Right now we're about to start one of our famous thunderstorms, so I'm disconnecting my radios and PC. Dave"
May 28
mike hadley replied to William David Howard's discussion Philly Power Transformer
"run the transformer for a while with the series lamp, does it get hot?, mine did, in less than a couple of minutes, first a familiar hot insulation smell followed by a feint crackling. I don't know where you can get your transformer rewound as…"
May 28
William David Howard replied to William David Howard's discussion Philly Power Transformer
"OK, the HV secondary windings produce the same voltage either side to CT within a volt.  The filament windings are not as close, 3.10 and 3.40 VAC to their CT.  The rectifier heater winding is not tapped, but it produces exactly 5 VAC…"
May 28
mike hadley replied to William David Howard's discussion Philly Power Transformer
"Another one to try is wind the transformer up on your variac and series lamp and check the ht output windings, they should be roughly the same within 10v or so, or another check is with another transformer run the heater windings backwards, this…"
May 28
William David Howard replied to William David Howard's discussion Philly Power Transformer
"Good suggestion!  Thanks, Mike.  I don't think I have one here, but I probably can come up with something or borrow one next week.  Dave"
May 28
mike hadley replied to William David Howard's discussion Philly Power Transformer
"William, Have you got an inductance meter that can measure the inductance of one of the larger inductance winding,(ac input is good) if you have measure this winding then apply a short to another winding (Ht output) on the transformer, there should…"
May 28
William David Howard replied to William David Howard's discussion Philly Power Transformer
"Thanks for your help!  The PS/Amp chassis is empty of tubes and totally disconnected from the tuner and speaker.  The choke output leads are both disconnected from the filter caps.  The filter cap at the choke inputs is…"
May 28
David C. Poland replied to William David Howard's discussion Philly Power Transformer
"That is a big power transformer. May be ok. I seem to recall a bit of glow on the amp only without tubes for an AW-23 too. You sure there is no load? All tubes out of the amp? The speaker and the receiver un-plugged?  The B+ winding voltage…"
May 28
William David Howard posted a discussion

Philly Power Transformer

I built a light bulb test jig supplied through a Variac to protect my Philly's power supply while I get the PS/Amp checked out.  I notice that with the rectifiers removed and no load on the filament winding my 100W bulb glows dimly when the primary winding voltage is at 115VAC.  Primary current is 275mA.  I know there is always a small "magnetizing" or leakage current in a real transformer with no secondary load, but how much is too much for this one?  Does anyone have that info, or can you…See More
May 28
William David Howard replied to William David Howard's discussion Which Philly do I have?
"Thanks, Norman!  That does look like my radio.  Now I know what dial glass to look for.  The DG-118D at Radio Daze sounds right, but I'll get a photo from them to be sure. Dave"
Apr 8
Norman S Braithwaite replied to William David Howard's discussion Which Philly do I have?
"Dave: Your Philharmonic is an AM Beam-of-Light version with logging vernier described in service literature as the revised Philharmonic.  Photos of the dial can be found at https://www.flickr.com/photos/kb1awv/sets/72157631388706840/ (scroll…"
Apr 8
William David Howard replied to William David Howard's discussion Which Philly do I have?
"I have uploaded 3 pix to My Photos.  In comparison to FIG. 8, there are no "FM tubes" on the RH side in my photo, nor is there a VR-150 at the back.  Does this help?  Thanks! Dave (William David Howard)"
Apr 8
William David Howard posted photos
Apr 8
Kent King replied to William David Howard's discussion Which Philly do I have?
"Dave - Can you post a few pictures of the chassis? It may help to determine if it isn't the FM set. I'm almost certain it is an FM set (broken dial is correct). Reason is...BB443 was built on 22-Aug-1942. So your set was probably built…"
Apr 8

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