EH Scott Radio Enthusiasts

The Fine Things are Always Hand Made

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…"
3 hours ago
David C. Poland commented on Rick Busche's photo
Thumbnail

IMG_1518

"They look nice with the blue Arcturus tubes and lacquered copper. For full impact clean the tubes and chassis. Then use auto mobile wax on the copper. (I like Turtle liquid car wax)"
4 hours ago
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,…"
4 hours ago
Phil Bartells liked Carlos Insa Gracia's photo
5 hours ago
Phil Bartells shared Carlos Insa Gracia's photo on Facebook
5 hours ago
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"
8 hours ago
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…"
8 hours ago
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…"
8 hours ago
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…"
9 hours ago
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"
10 hours ago
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…"
10 hours ago
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…"
10 hours ago
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…"
12 hours ago
Phil Bartells commented on Carlos Insa Gracia's photo
Thumbnail

Special Westerly_KUTZTOWN_MAY_2017

"I have the normal Westerly (not grande) like this with Allwave 23.  Is That what you have? Phil"
13 hours ago
Phil Bartells shared Carlos Insa Gracia's photo on Facebook
13 hours ago
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
15 hours ago

Members

 

Photos

Loading…
  • Add Photos
  • View All

Forum

Philly Power Transformer

Started by William David Howard. Last reply by William David Howard 3 hours ago. 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

Old tube boxes

Started by mike hadley. Last reply by Joseph W Strickland on Friday. 11 Replies

Hi,Can anyone supply me with some scans of old tube boxes, I would like to reproduce the artwork and make boxes for storing spare tubes in, they would look better than plain white ones as supplied…Continue

Can Anyone ID this Scott Speaker

Started by Joe Miller. Last reply by Joe Miller May 11. 7 Replies

I thought this was a Masterpiece Speaker.  It has the 8 pin plug and it is wired like the Masterpiece schematic shows except for pin 7 which is connected to ground rather than to the 4th terminal…Continue

Blog Posts

EH Scott Model 510 Tuner Service Manual/Alignment

Posted by Steve Larrabee on May 21, 2017 at 10:02pm 2 Comments

I came into a 510 Tuner recently and have renewed the caps and resistors as necessary.  I have the schematic for the Tuner and also the Power Supply/Audio Amp.  I built my own power supply/amp with 6L6s and a 6SN7 and diode rectification because one did not come with the tuner.  Now I need the alignment instructions for the tuner or better yet, the Service Manual.  Would anyone out there have a .pdf that would help??  Thanks very much, best, Steve 

Scott tube shields

Posted by Keith Lowe on April 27, 2017 at 8:25pm 1 Comment

All, the Iowa antique radio club is having an auction this Saturday and we've got a box of chrome tube shields that is labeled "Scott tube shields".  I could probably bid on these if anyone wants them.

I have no idea what model they belong to.

Keith…

Continue

Battery Allwave, 6 volt

Posted by John T. Meredith on April 26, 2017 at 7:01pm 0 Comments

Does anyone have an idea of what speaker went with the Battery Allwave sets of the early 1930s?

These would be the 6 volt and 2 volt Allwave receivers.

Cheers,

John

Shield Grid 9 Renewing...........

Posted by Steve Larrabee on March 13, 2017 at 8:00pm 33 Comments

Hi Kent:  I am working on a Shield Grid 9 now that is in very good shape. I have dismounted the SGA (shield grid assembly) because of low filament voltage on the three 22s - max I can get is 2 volts with 5 volts on the entry bus.  Taking that SGA off and opening it was much more of a chore than necessary because the designer apparently didn't think it would ever be required.  The paperwork discusses the short wave ability of the SG-9 and the need to change the coil in the 630 Antenna…

Continue
 
 
 

Notes

Welcome to our Site!

Welcome to The E.H. Scott Enthusiasts Site. If you are looking for manuals or service data on a Scott set, please click on the "Scott Info Archive" link above. If you have questions for forum members, a picture is worth a thousand words, please post a pic or two to help describe your question or problem. Finally, this forum works best when we all contribute. Answer questions, provide feedback, and if you have a document worth sharing, please scan it in as a PDF and forward it to me: Kent…

Continue

Created by Kent King Feb 22, 2016 at 8:06am. Last updated by Kent King Feb 22, 2016.

Notes Home

Welcome! To view all notes, click here. Continue

Created by Kent King Nov 8, 2013 at 9:38am. Last updated by Kent King Nov 8, 2013.

© 2017   Created by Kent King.   Powered by

Badges  |  Report an Issue  |  Terms of Service