I also replaced the original screen grid resistor with a higher wattage type and the control grid coupling capacitor which might or might not be leaky. This yields better performance and stability than e. My solution was to leave the unbypassed 39 ohm cathode AF and DC feedback resistor in place and reducing plate current by pulling the screen grid voltage down by connecting a 27kohm 2W resistor to GND there is a convenient tie point on the turret nearer the p.
There is some additional food for thoughts: not only is the 6BF5 in this radio operated too close to - or even outside - the published limits but curiously the bias voltages marked on the circuit diagram do not compute when you take the actual resistor ratios They will again be different when measured, as tolerances, aging and grid current by an overheated 6BF5 will change the values further. The higher line voltages in the US today the 51S-1 was designed for VAC, not V or so have certainly also something to do with the overheating of the tube - but that's not the whole story. Just keep this in mind when looking at e.
#Collins 51s 1 hf receiver tv#
The 6BF5 was designed to produce audio power with low plate voltage in TV sets and for this purpose has a powerful heater. As I spent some time analyzing this matter armed by tube manuals, several 6BF5s by different manufacturers it is still not an expensive tube and various pieces of commercial test equipment, I thought this information might be helpful and save others time better spent. My goal was to implement the original design choice, just to get rid of some problems. These terms and conditions are subject to change at any time and without notice.The "Hot-6BF5-Question" keeps popping up - as do projects for replacements - and as it is many years ago I posted the results, it is described here. Failure to comply with these rules may result in being banned from further commenting. The administrator has the right to edit, move or remove any comment for any reason and without notice. You agree not to post any material which is knowingly false, obscene, hateful, threatening, harassing or invasive of a person's privacy. You acknowledge that all comments express the views and opinions of the original author and not those of the administrator. By submitting a comment, you are declaring that you agree with these rules: Although the administrator will attempt to moderate comments, it is impossible for every comment to have been moderated at any given time. I have read and agree to the terms and conditions. Comments No comments yet.īe the first! Add Comment. Scanned document, reading partly badly, partly not readable.
Collins Telecommunications 51S-1 Receiver.Ĭollins Telecommunications. By submitting a comment, you are declaring that you agree with these rules. These terms and conditions contain rules about posting comments.
#Collins 51s 1 hf receiver manuals#
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