"I wonder if the 38 ohm went with the 5 knob and the 19 went with the 7 knob version? (or vice verse?)"
The Fine Things are Always Hand Made
Joe Miller's Discussions
AW23 Speaker Question
Started this discussion. Last reply by Joe Miller 16 hours ago. 8 Replies 0 Likes
I am starting a patch job on a spare AW23 Speaker. Before I start, I decided to wire check the FC, VC, and all the connections to the plugs. It appears that the speaker wiring has not been modified…Continue
New Owner of AW27 Custom
Started this discussion. Last reply by Joe Miller Nov 25. 8 Replies 0 Likes
Hi everyone, I recently purchased a "custom" AW27. I say custom because it was constructed by modifying an AW23 tuner and putting together two AW23 amp chasses. It sits on a custom made Napier…Continue
Want to Buy Audio Output Transformer
Started Nov 18 0 Replies 0 Likes
I have an AW23 pedestal speaker with a missing AOT. Anyone have a spare out there?ThanksJoeContinue
Which Scott do these Speakers go to?
Started this discussion. Last reply by Kent King Sep 4. 18 Replies 0 Likes
I am redoing my workspace and found these speakers among all my Scott stuff. The tag says they go with my Phantom, but I don't think that is correct as I have not been able to find any reference to…Continue
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"The primary difference between the early 1935's 38 ohm speaker and the 1936-7 version is the later is wired as a 19 ohm speaker - as I recall.
See Riders Vol 14. - Scott page 27 and also the 1936 circuit diagram showing speaker…"
"I don't know if there are variations in the wiring, but there are 2 different AW23 speakers.
I think the early ones had a voice coil impedance of 38 ohms, and the later ones were 19 ohms. The proper output transformer takes care of…"
"Aha, Tom
I just checked mine again and the wiring matches my schematic except plug 2 and socket 2 pins 1 is used (rather than pin 2 as shown) for the ungrounded side of the voice coil. Other than that mine matches just fine. Would you…"
"Joe and Kent. There are wiring differences in the tweeter and bass speaker wiring, that were pointed out some time ago. I have the schematics for both, and here are the changes. Both are for the 5 pin plugs and sockets. First variation for…"
"I will recheck everything later today and report back. Thanks for your help, guys."
"What Thomas said tracks what I have seen. I have not identified a difference in the AW23 speaker connections for the tweeters. But I never say never with Scott sets...
Kent"
"Joe: according to the schematic I have, for the 5 pin plug, pins 1 and 7 should be about 19 ohms, so 15 is good. Pins 3 and 4 should be 3700 ohms and pins 4 and 5 should be 1300 ohms. The 7 pin plug to the amp has the output transformer and…"
AW23 Speaker Question
I am starting a patch job on a spare AW23 Speaker. Before I start, I decided to wire check the FC, VC, and all the connections to the plugs. It appears that the speaker wiring has not been modified but it doesn't match the schematic I have of the amp (35 watt amp). The voice coil measures about 15 ohms (DC) which probably means it is the 19 ohm VC rather than the 38 ohm VC.Are there variations in the wiring for the various AW23 Speakers? And if so, which ones went with which version of the…See More
"Anywhere I mentioned a 75 tube I should have said 76 tube. Sorry for any confusion.
Joe"
"Thanks for this info. I have a second Allwave 23 that was seriously messed with by a previous owner. I have done a complete restoration, and it works. Brought it back to a stock Allwave 23. My first Allwave 23 is a slightly earlier version. First…"
"The schematic is not correct. As mentioned the 75 2nd detector is not shown and the 6B7 should be a 6D6. I have attached a spreadsheet that itemizes the changes made to the AW23 to achieve an AW27."
"If the shown schematic is correct, the addition of the expander required the omission of 4 tubes in the original allwave 23 to keep the same chassis. Those appear to be the 76 second detector, the meter amp, and both 6C6 driver tubes, which moved to…"
"Yes, mine has the 6D6 and 75 design which is like the other AW27's. I have 19 tubes on the tuner. "
"Ok, I confused the RF tube with the RF AVC tube which I see is included and correctly labeled. The schematic shows 18 tubes whereas the original AW-27 sets had 19 tubes on the tuner (neon bulbs included in the count). The 6B7 second…"
Joe Miller's Blog
WTB Speaker for Scott Masterpiece
Posted on October 1, 2019 at 7:05pm 2 Comments 0 Likes
I picked up a tuner and amp at the recent radio auction in Indy, but no speaker. So I am looking for one. It has an octal plug on it and the speaker has two field coils:
One at 680 ohms and the other is 125+65 ohms (it is also split)
Can anyone point me in the right direction?
Thanks,
Joe
AW-12 Single Dial Power Supply
Posted on March 13, 2018 at 11:02pm 0 Comments 0 Likes
I am looking for a PS. Don't need tubes necessarily.
Anyone have one for sale?
Philly Amp wiring
Posted on July 20, 2016 at 9:57pm 1 Comment 0 Likes
I am working on a Philly amp and am finding a number of wiring mods that deviate from the schematic. Some are due to someone bypassing a bad audio transformer and for adding a second phone plug input with volume/mixing pots.
But I also found a 125 ohm Candohm type resistor that is factory mounted to the side of the amp chassis. It is connected in series to the cap connected to pin 6 of the set plug socket and then tied to ground. It doesn't show on the schematics that I…
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