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The Fine Things are Always Hand Made
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Michael J Boessen
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Michael J Boessen's Discussions
Wheels For The AW15 Tasman Cabinet?
Started this discussion. Last reply by David C. Poland Jul 14, 2023. 5 Replies 0 Likes
Hi, All:Putting the finishing touches on a Scott AW15. I notice some 3/8" holes at the corners of the base. My cabinet had large nickel plated tacks on the bottom, but the holes make me think that…Continue
Scott AW15 Broadcast Sensitivity
Started Jun 25, 2023 0 Replies 0 Likes
Hi, All:I've been working on problems with the oscillator on this thing for 3 weeks, the problem being, on the red and green bands the oscillator dies at the low end. I finally gave up and am hoping…Continue
AW 15 Tuning Condenser Screwup
Started this discussion. Last reply by Michael J Boessen Jul 4, 2023. 10 Replies 0 Likes
Hi, All:I have been struggling with the oscillator in my Allwave 15 project for over 2 weeks now. I thought I had started a thread here about it, but now I can't find it. To begin with, I have…Continue
Scott AW 15 Finicky Oscillator
Started this discussion. Last reply by Thomas Day Dec 13, 2023. 28 Replies 0 Likes
Hi, All:I've been working on a Scott AW 15, with a lot of help from folks here, and I really appreciate it!!I have the cabinet looking awesome, most of the chrome polished up, and everything working…Continue
Michael J Boessen's Page
Latest Activity
"Finally back on the AW-12!
At a very reasonable price I purchased 2 used 45's that test very close to each other and work very well in the radio.
I have good sensitivity on the BCB now - solved after some tube swapping. All tubes tested…"
"The AW-15 was designed to use 2A3's. Note - the tube sockets have the tube numbers embossed.
The prior 12 tube models used type 45 output tubes.
The amp circuit design, output transformer and speaker voice coils were specific to the…"
"Hi, Lars:
Well, this might be better addressed by someone smarter. On the upside, the 1619 has lower filament current and higher plate voltage rating. It has higher plate current, so might tax your power transformer and audio…"
"Mike and Dave,
Now that the receiver sensitivity is quite good I'd like to be using it for more extended listening times. During the testing and alignment the listening times were relatively short after the set was warmed up good.
As…"
"Hi, Lars:
One of the worst things for antique radios is LED lighting. The biggest offender I have seen are the LED replacements for fluorescent tubes, but all LED lights are possible sources. Anything that has a power supply with a…"
"Mike,
Thanks for the input.
In regard to how quiet the receiver is I do have a high level of noise external to the receiver here. Based on my checking this RF noise is due in large part to the new power meters that the local utility…"
"David,
Thank you very much for the information !"
"FYI - check out the Scott Super antenna - first version first offered for the AW-15 and also the AW-23.
See Info Archive, Set Folders, Accessories, Super Antenna System
- a double di-pole with 110 foot twisted lead in - to a chrome…"
"Hi, Lars:
I'm not sure what the caps on the oscillator filament are supposed to be for. One of the things the Scott guys were very focused on was to have a very quiet receiver, IE, crank up the volume with no signal, and hear nothing in…"
"Mike
Thank you for the suggestions and information.
I have replaced the resistors in the IF cans due to values that were up to 50% off. Paper capacitors were also replaced.
I recapped the entire unit except for the mica capacitors.
In order to make…"
"Hi, Lars:
There are smarter guys on here than me. I presume you have replaced the caps in the IF coil cans. Also, I'm guessing you know you need a tuning can to put in place of the chrome one while tuning. You have to have…"
"Hello Mike,
Your comments are very interesting. I've been working with an AW-12 Deluxe for some time now and it also has mediocre BCB reception. This appears to be a later version and some of the circuitry is close to that of the…"
"Looks pretty good.
The control shaft holes usually allow a bit of shifting the receiver in cabinet.
The AW 15 chassis was shipped with a 8x10 or so drilled Walnut wood panel with escutcheons attached.
The original owner had the chore of…"
"The weighty tube cover does have a hole in the top sized to allow for a grid cap,... and ventilation.
But, it does not merely slip over the tube, depending on the tube shape and height.
Rather, remove the tube, slip the lead weight up from the…"
Comment Wall (1 comment)
- At 9:27am on July 5, 2023,
Robert Meader said…
I had a similar problem with a Philharmonc the high shortwave band cutout at the low end. The cause is either is "Q" dropped to low in the local oscillator coil or the transconductance of the local oscillator is to low. I suspected originally since the Philharmonic uses multiple 6j5's scott selected the ones with highest emission. Now 80 years later I think the shellac may have collected moisture lowering the coils "Q". Now you could buy a bunch of 6j5's and select the best one. The problem is the price of 6j5's is through the roof! I decided to think out of the box and use a later design tube. So what I did was mount a a 9 pin tube socket to a 8 pin octal plug. I wired the 9 pin tube socket for a 12au7/12at7 types of tube. I plugged the adapter into 6j5 local oscillator tube and gave it try with several 12au7's and 12at7's. They ALL worked fine so I used the 12au7 since is a low "emu" tube like a 6j5 only about 30% higher. Now to apply the same thing to a "56" tube you will need an external 6 volt to power the 12au7/12at7. You could try a 6 volt battery to see if it works before adding a 6 volt filament transformer to the power supply or just buy a large bunch of 56's.
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