01-27-2023, 09:12 PM
Hi Rob,
I am glad to help. Some people do crosswords, some play Sudoku. I like to solve real problems. Besides, If I am here, I'm not blowing money I don't have on ePay, buying radios that I have no room for!
This thing may best the ARBEIII. I am happy with mine, but I like the B Supply on this. For one thing, there is a 180V output. You can get 0.7W out of a 71A in the output stage of an A-K 30. Only problem is that you need -40V for C- to do that. The C- section of your supply likely tops out at -22V like the ARBEIII. The ARBEIII may have more guts on the A side. The C side looks about the same, but there is not much current drawn by a C Circuit.
I Have an A-K 30 and a 33 that I have to fix. I have also repaired the AK10, 20, 20C and 35 in my collection. These sets are not hard to figure out. The worst part of a 30 is the same as the worst part of a 35- the crumbling pot metal pulleys and brass bands that couple the 3 separate tuning caps to the single dial. However, you can reach inside and tune it manually. Other issues are the transformers. They tend to open. The P-T156 sold by AES for about $16 apiece. Similar transformers are available from the ARBEIII Guy. These are supposed to be better. The only other 2 things that are a big issue are the grid leak and 2 wirewound resistors between the tuning cap and coil and the grid if the 1st and 2nd RF Amp. These can be bypassed. The purpose of them is to suppress the possibility of the RF amps oscillating. RCA used these in the Radiola 16 and 17 also. The alternative was the Neutrodyne circuit, but they would have to pay royalties to the Hazeltine corporation (right in my hometown, about 2 miles from me when they were still Hazeltine).
I am glad to help. Some people do crosswords, some play Sudoku. I like to solve real problems. Besides, If I am here, I'm not blowing money I don't have on ePay, buying radios that I have no room for!
This thing may best the ARBEIII. I am happy with mine, but I like the B Supply on this. For one thing, there is a 180V output. You can get 0.7W out of a 71A in the output stage of an A-K 30. Only problem is that you need -40V for C- to do that. The C- section of your supply likely tops out at -22V like the ARBEIII. The ARBEIII may have more guts on the A side. The C side looks about the same, but there is not much current drawn by a C Circuit.
I Have an A-K 30 and a 33 that I have to fix. I have also repaired the AK10, 20, 20C and 35 in my collection. These sets are not hard to figure out. The worst part of a 30 is the same as the worst part of a 35- the crumbling pot metal pulleys and brass bands that couple the 3 separate tuning caps to the single dial. However, you can reach inside and tune it manually. Other issues are the transformers. They tend to open. The P-T156 sold by AES for about $16 apiece. Similar transformers are available from the ARBEIII Guy. These are supposed to be better. The only other 2 things that are a big issue are the grid leak and 2 wirewound resistors between the tuning cap and coil and the grid if the 1st and 2nd RF Amp. These can be bypassed. The purpose of them is to suppress the possibility of the RF amps oscillating. RCA used these in the Radiola 16 and 17 also. The alternative was the Neutrodyne circuit, but they would have to pay royalties to the Hazeltine corporation (right in my hometown, about 2 miles from me when they were still Hazeltine).
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards,
MrFixr55
