[jshorva65]

Well, I just found the ultimate alignment instrument for these sets with 23.5 MHz IF center frequencies. The Philco 7008 Visual Alignment Generator is truly the nearest thing to a 23.5 MHz equivalent of the (44 MHz Only) B&K 415. I bought my Philco 7008 on eBay and it was already known to power up per the auction listing. When I received it, things turned out even better than I expected as I found that some prior owner had already installed a full complement of new Orange Drop caps. I added a 1A line fuse, ordered the manual from A.G. Tannenbaum, and set about checking calibration as soon as I got the manual. It was amazingly close to its +/-1% specification for the Marker dial, but the Sweep dial was running about 5%. Since the seller wasn't aware of the need to put two 8-32x3/8" locking screws into holes provided on the bottom and secure them to prevent the EMR modulator from being bounced around during shipment, one of the (still soft and pliable) rubber suspension cushions had slipped out of place and needed re-positioned. After fixing that, I set the Sweep dial to track within +/-1% on both bands. Next, I brought all 3 bands of the Marker dial into factory spec. Next, I finished up by setting the maximum sweep width to exacly 15 MHz and ordered a NOS 3MP1 CRT as a spare since I plan on putting LOTS of hours on the still-usable original tube.

Setting both the Sweep Center Frequency and Marker dials to 23.5 MHz via the built-in crystal calibrator and vernier dial interpolation and injecting a digitally-verified marker for a 750 kHz marker interval (using my Precision E-200-C RF Generator as the second marker source and Elenco frequency counter to verify exact 750 kHz output) via the "chassis eddy current" injection method, the marker points with the sweep width at 8 MHz were 19.75, 20.50, 21.25, 22.00, 22.75, 23.50, 24.25, 25.00, 25.75, 26.50, and 27.25 MHz. I had already pre-set all the IF couplings and traps via the pre-alignment procedure in the RCA 630TS service manual for the pictured Fada 799 chassis. Here are the results of the fine-tweaking of the curve as displayed on the Philco 7008.