Recent content by Tom Bavis

Sams folder says 1.6 A input, so 2A slo-blo would be about right if you have to replace the breaker (I've had a few bad ones - the last Moto 3-channel was one).

Sams folder here: https://www.radiomuseum.org/r/sears_roeb_silvertone_275_ch_5285939.html

That chassis number is not listed in Sams - there may be similar ones, but there's really no way to find them. And models 9316 and 9316T are not anything close - one has a receiver chassis, the other is a powered speaker - but model number would be on the cabinet, not chassis.

2 meg volume control is the load for the ceramic or crystal cartridge - a 100K would be better, to reduce loss of treble due to Miller effect. ( Though the loudness compensation makes up for that somewhat) The .005/3VK is protection against overvoltage (and treble reduction) - always used in...

8"? RC was their prefix for PA speakers - my 1950 catalog stops at RC-57. I have one of those "wedge" enclosures - cost me a dollar without a speaker.

Even 1Hy would be an improvement - the ST35 didn't have one originally. 2 Hy is fine if it fits.

And some tubes may show gas at first, clearing up after a few minutes warmup time.

Yes, I've seen wirewound resistors with melted ceramic coating - sometimes with evidence of fire nearby. I take it that is the 220 Ohm resistor? A tube with a shorted screen or a shorted cap may be responsible. BTW - the chassis layout drawing for the SAT-300 on Radiomuseum appears to be an...

Could it be: https://www.radiomuseum.org/r/nipp_lw_mw_fm_multiplex_stereo_receiver_sat_300x.html

RCA owned the patents that everyone used, so a label mentioning RCA patents doesn't tell you much. I think there's a name at the bottom of the dial. Brands on the tubes sometimes point to the actual brand name. Sometimes there's a a label inside or on the bottom.

Transformer inductance also changes with signal level, increasing at low frequencies up to the point of saturation, so low-frequency response could be better than a low-level measurement would indicate. And DC current also affects inductance, though this effect is reduced by gapping the core...

First job after college was a bench tech at at a 2-way radio manufacturer. And started working on RF amplifier assemblies - the final tubes weren't installed, and no 800V present, but there were a few components with 250V on them. And I would always find them with a conductive tool. which...

50% UL ratio is not uncommon; in fact it's optimum for some tubes. 100 Ohm screen resistor makes sense, 100 Ohms at the center-tap of a P-P transformer does not. This plus the relatively low inductance point to a single-ended design. Connect a variable DC supply to the primary and measure...

Needs more negative bias - higher value cathode resistor - than 6BQ5

Only a few 10- tube chassis from Loewe: Atlas-Luxus-Stereo 3817T/W Vineta-Luxus-Stereo 3801W Vineta-Luxus-Stereo 3801T Trianon-Stereo 2655 All match the tube list except they have an ECC83 (12AX7) and EM84 and one less EF89