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I have not looked at the CSR 5 handbook but suspect you have the order of the RF reversed.?The other tubes , like the 1853, are really not like the 6SG7.? They were designed for wide band television

The AR 88 was designed to be a very advanced performance general purpose receiver.? They were never sold commercially?The tubed were the most advanced available at the time . They are very

Steve, Jacques, Richard + i somehow found this link where you can go down to “usages” of the 6SG7 and click and find some interesting but uncertain information it shows Sg7’s but sometimes

everything you ever wanted to know about 150/500 PS. POWER SUPPLIES | WD0GOF<https://wd0gof.com/hallicrafters-radio/technical-discussions/power-supplies/>

Seems reasonable for no load condition. Walt Cates, WD0GOF https://wd0gof.com/Hallicrafters Your past has no control over your future. Only your NOW can impact your future.

I should also add (after my HT45 Loudenboomer power supply experience) that if you do not have a load on a choke input power supply, the voltage can measure pretty high. -- 73/Rick WA6III

Howdy, You might consider putting a variac on it and loading both the high and low voltage B+ to see where they are.? I have found that modern line voltages do increase the output voltages a bit. --

RICHARD , GOOD SLEUTHING!; looks like you found the 6SG6 used very early; and to find 5 of them in one radio. I wonder if they were developed by RCA, well they must have been. The original question

About the 6SG7… Another receiver from the same Era than the RCA AR 88 is the Canadian Marconi Co. CSR-5A. 1st RF: 6SK7, 2nd RF: 6SG7, 1st IF: 6SG7, 2nd IF: 6SK7. The CSR-5A is also the first

This PS150 has been around for 20 years on my shelf and is now recapped.? Checking output voltages at 120VAC gives the following: B+? 690v LV 400v These seem high though I know they will drop under

I've had my fun resurrecting this fairly rare SR-75 transceiver but it is now time to let it go. It's in excellent working condition, had all the caps replaced, resistors checked, aligned, and new

The 6SG7 dates from at least as early as 1940.? It is used as both RF and IF stages in the RCA AR 88I don't know what other receivers of that Era it is found in.? It's also found as? the RF? stage

Hi again steve Interesting stuff.. hope you unravel the design differences for us. I don’t recall the 6SG7 as a kid; but my very hazy memory thinks it was a later octal. the tung-Sol sheets I just

I must look at the schematic to see if I can figure out the reason for this.? It's not too unusual to see different tubes used in rf stages but is in if stages.? ?Sent from my Galaxy

Chuck, Thanks for providing the Crystal. 73s Ricky KR7W

Thanks, Don. I’m admittedly a bit fussy about a couple of things – one is that I try to restore as true to the original as possible. This can be particularly challenging when a radio has been –

Richard , and gang I believe Steve was talking about the tubes in the original design, and not discussing swapping tubes, but your notes about swapping seem valid, but are likely are only some of the

Steve I agree with your comments, which I believe, apply to various big old consoles as well as communications receivers. Your original comment “6SK7 was used for the 2nd IF, while a 6SG7 is used

Don, Very interesting! Well, as we all know a lot of this old equipment was designed for a specific price point and target audience. There were receivers with weak front ends that had awesome audio

It isn't the gain but the Internal noise.? ?One can have too much gain.? The internal noise of a tube is roughly proportional to its Gm.? A 6SG7 has about four times the Gm of a 6SK7.? One