The Fine Things are Always Hand Made

Scott Phantom sensitivity?

In "Confidential Masterpiece VI Specs" the sensitivity of McMurdo MP VI is given as 0,5 microvolts in 140kHz - 19MHz range and 2mkV in 15MHz-70MHx range, which is a very, very good number even by todays' standards. I never managed to find the same figures for Phantom. May be some of you guys know it? Thanks a lot in advance for sharing it.

0 members like this

▶ Reply to This

Replies to This Discussion

Permalink Reply by Leonid Soloviev on March 6, 2011 at 6:08pm

OK, wanted to come back to this question.

In Scott News (11.1038) there is information for (AM only) Scott Phantom - sensitivity can be switched between 0,6 and 10 microvolts.

Which methode of measurement was used?

Today, as far as I know, the sensitivity means a value of the signal at the input, sufficient to get signal to noise ratio at the output equal to 3 (10dB). Was the same definition used in 1938? I checked Scott Phantom Service Manual, User Manual etc - nothing.

▶ Reply

Permalink Reply by Y2K Bruce on March 7, 2011 at 5:20pm

I have an original 1937 November Radio News ad by EH Scott on the 'new' Scott 16 set and in the ad, he states the sensitivity is less than 0.6 microvolts.

Sees like a pretty technical detail to put in a magazine ad.

▶ Reply

Permalink Reply by Leonid Soloviev on March 10, 2011 at 6:06pm

That is why I keep asking this question - how they measured the sensitivity? What was the definition of sensitivity in 30s? Less than 0,6 microvolts is about the same level, as the noise of the tubes... So these numbers, like 0,5 mkV look too good to be true...

Y2K Bruce said:

I have an original 1937 November Radio News ad by EH Scott on the 'new' Scott 16 set and in the ad, he states the sensitivity is less than 0.6 microvolts.

Sees like a pretty technical detail to put in a magazine ad.