MIT Flea Photos - May 2017

The April MIT Flea was on Easter, so the May Flea was the first of the season for me. I neglected to get my pre-paid season pass, so I had to wait with the un-prepaid vendors to get in.

Attendance seemed pretty good. I heard attendance in April was pretty light, but the crowd seemed pretty good this time. And the power-plant construction has been delayed, so the outside parking lot will be available at least through July.

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Even though I was at the tail of the vendor line, the large outside vendors were still setting up when I took my first tour.

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Chuck Ochs was still setting up.

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He always has good stuff, usually fully restored. Consequently the price is usually too high for a bottom-feeder like me (although I did buy a nice HP 428A from him at last spring's NEARC meet).

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Huh, what's this? Some oddball variant of a Waterman pocket scope?

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Nope! It's a Sel-Son Electronic Tube Corp. "CRT Substituter" Model CS-5. Patent Pending.

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It looks to be in pretty good shape.

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It's just the thing for servicing TV sets. I hope I never get bitten by that bug.

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The fellow also had a very stylish Stromberg Carlson PA amplifier.

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Harrison Labs became a division of Hewlett Packard in 1961, but I think they continued to use their own name on the supplies for a while thereafter. I don't know when they switched to branding their supplies as HP, but this one predates it. It was introduced in the 1963 HP catalog at a price of $99 plus an additional $20 for the meters. The July 1962 edition of the HP Journal has a nice article from Harrison on the design of their power supplies.

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I couldn't pass up this Tektronix 184 Time Mark Generator. I have a pile of scopes to be restored and calibrated. 

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Al Krysieniel had this interesting Delmonico clone of a Zenith Trans-Oceanic ...

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... along with his usual assortment of General Radio gear. That's a GR 483-C Output Meter to the right of the Delmonico. I wrote up another blog post about it.

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Here's Al on the right with a prospective customer. Those walnut cases with the French polished shellac finishes are just beautiful.

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A "PI" (Potomac Instruments) AG-51 audio signal generator. It looks like a nice instrument, but the $100 marked price dissuaded me from even making an offer.

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I didn't know Collaro survived into the late 1960's era of record changers.

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I didn't take note of the model number, and the scope doesn't have one on the front panel. It's one of Tektronix's low-end T900-series service scopes, but the T912 (10 MHz), T922 (15 MHz), T932 (35 MHz), and T935 (35 MHz, delayed sweep) all have similar front panels. Examining the photos on the TekWiki, this has delayed sweep and so is a T935 or T935A.

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At the time, I didn't notice the HP probe. It looks like the style on the HP 425A and HP 411A. I guess it's an HP AC-21A 10:1 probe with the slip-on pincer jaw tip. These were developed for the HP 150A oscilloscope, HP's first high-bandwidth scope. See the HP 150A description in the 1960 HP catalog

I should have bargained for just the probe.

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Here's a nice Solar CB-1-60 capacitor analyzer.Phil's Old Radios has a restoration blog and a link to the military manual.

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These late-60's/early-70's Japanese AM/FM table radios appeal to me. I've never seen a Toshiba before.

I've put additional photos into the album below.

© Steve Byan 2011-2019