"to clarify this discussion for others. The Amperite is bigger than a globe 45. Here is a 12-10 NIB that I found:
IMG_0440.jpeg
Box states for "receivers with an 80 - 85 volt primary". Unsure whether it is suitable sub for the…"
The Fine Things are Always Hand Made
Christopher Tubbs's Discussions
12-20 tube in AC-10 set
Started this discussion. Last reply by David C. Poland Jun 26. 13 Replies 0 Likes
I have a AC-10 and the power supply uses 2-245 tubes, one 280 tube and a Amperite 12-20 tube. The 12-20 tube's base is loose. I believe they can be re-glued, but I was also researching the…Continue
Wunderlich tube in AW15
Started this discussion. Last reply by David C. Poland Jun 16. 8 Replies 2 Likes
I have a AW15 which, according to Mr. King, was made early October 1934. I am assuming that this set has to Wunderlich tube in it. I'm trying to figure out here that tube is placed on the chassis. …Continue
Christopher Tubbs's Page
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"Well, I expect that it will look like a 12-20 ballast with the iron wire in a glass envelope but I prefer to call it a ballast to differentiate it from a type 126 tube thus avoiding the present confusion.
Norman"
"Hi Norman. Forgive my ignorance, but what would a 126 ballast look like if it's not a tube? Like a "box" with wires coming out of each side? And is a 126 ballast still available?"
"The 126 on that list is a type 126 ballast, not a type 26 (127, 226, etc) tube.
Norman"
"Hi Kent,
Here's the image of "New 1930 model" paper:"
"Hi Norman! Here's the link: https://antiqueradios.com/ballast/
If you scroll down to the Table II (specifications) heading, it starts listing the different tubes and the last column says Exchange with
...and when it goes…"
"IF the type 26 tube were to be a decent electrical substitute, there is a pinout issue.
The 26 tube side by side filament pins are #1 and #4, which are the 2 fat pins.
The amp's 2 pin socket fails to connect the filament pins. So…"
"Christopher -
Could you post a copy of the "New 1930 model" document, I do not believe I've seen that before. And if possible, I'd love to get a scan of the instruction manual.
I have an AW23 in my collection that I purchased…"
"I used to own an HRO-60 receiver which uses that same ballast tube. A 6V6 substitutes for the 4H4C fine.
http://www.emmittsfixitshop.com/Projects_HRO_4H4C.html"
"I would not completely discount the type 26 tube yet. Its filament may provide the correct voltage drop and some limited regulation. After all, the popular replacement for the high demand and scarce 4H4C ballast tube is a common type 6H6…"
"Thank you guys!
The power supply is a Type 45 and # 3177
The chassis is type 601 and #1992
Yes, it has the correct D-90 speaker. It's got the Scott name plate riveted on it and says D-90
It's in an Orleans cabinet.
What makes…"
"I'll add to Dave's comment: the reference that says a 126 is a substitute is totally wrong. A 126 (x26) is an AC triode. As dave noted, the 12-20 is a ballast tube (big resistor). If it works, re-glue it and keep going, you won't find…"
"Dealing with hen's teeth - a scarce vintage tube. I also have the same 4 tube amp - unrestored.
So glad to see Scott document confirming the proper Amperite. tube. AND the "work around" when the tube fails.
Several Scott models had…"
12-20 tube in AC-10 set
I have a AC-10 and the power supply uses 2-245 tubes, one 280 tube and a Amperite 12-20 tube. The 12-20 tube's base is loose. I believe they can be re-glued, but I was also researching the availability of 12-20 tubes and also if there was a replacement tube for it.I found a sheet on antiqueradios.com (I can share the link, but wasn't sure I can put a link to another website for some admin or site rules)...the sheet noted that a 126 tube was a replacement. I found some 126 tubes, but the 126…See More
"Take patience now to tube up an AW-15 receiver with a set of cobalt blue glass Arcturus tubes. I did that with an AW-12 Deluxe AVC Wunderlich tube set. The blue glass looks impressive with the chrome, even tho hidden inside the tube covers. Over the…"
"Coil%20Wheel%20Updates.pdf
OK - many things to respond to. I did attach these two items, they may be of interest. The 2A7/55 was the "final" AW15 design by Scott. The 2A7 is far superior as an RF stage than the 58. And a 55 is far easier…"
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