#1
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Dumont 304 scopes
Hi All;
What is the difference between the Dumont 304-C and the Dumont 304-H ?? Where they like improvements -A, -B, -C etc.. Or did they stand for something such as -C, Commercial, -H, Heavy Duty, etc.. THANK YOU Marty |
#2
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Scratching the head for old memories, I seem to recall that the entire series was pretty much identical. Mostly cosmetic differences, like the 401 vs the 401A, which simply had changed from inch calibrations to centimeter. I have owned several of these and don't recall any real differences. Maybe the H had higher sensitivity but I'm treading on thin ground here. Bandwidth on the entire series was about 100 kHz oops I mean 100 kc. I may still have some manuals.
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#3
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Hi!
I realize this is an old thread but I wondered if I could tap your knowledge. I'm looking for a manual for a Dumont 401A. Would you still have one? Second, I saw info, online, where Fairchild took over Dumont. Would you happen to know if the Fairchild 401A is the same as the Dumont 401A? Thanks for any info. Bob |
#4
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I think I still have Dumont 401/401A manuals. I used to own a 401R.
There were two versions, one with 'Sola' type power supply and the other with electronically regulated supply. |
#5
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If anyone ever finds a manual for Dumont scope type 250-AH, I'd love to have a copy...
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Audiokarma |
#6
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I believe the "H" stood for "high brightness" or "high intensity", as it had an additional high voltage supply for the post-deflection accelerator.
The schematic here: http://bama.edebris.com/manuals/dumont/304 shows the differences between the 304 and the 304H. The additional circuitry used in the 304H is shown in a dotted line area in the power supply. The note near the CRT intensifier connection describes the difference in the circuit. |
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