tag:blogger.com,1999:blog-8234406140077819810.post7012685859138593845..comments2024-03-25T13:20:22.146-04:00Comments on Retrotechnologist: TUBE-TYPE MIC MIXER, PART 2Roberta Xhttp://www.blogger.com/profile/09956807794520627885noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-8234406140077819810.post-17033055214377748342013-07-11T16:45:45.157-04:002013-07-11T16:45:45.157-04:00Some retro news for you:
To Avoid Cyber Espionage,...Some retro news for you:<br />To Avoid Cyber Espionage, Russia's Switching Back to Typewriters<br />http://gizmodo.com/to-avoid-cyber-espionage-russias-switching-back-to-ty-745269384<br /><br />Max Headroom was unavailable for comment. <br />Jimnoreply@blogger.comtag:blogger.com,1999:blog-8234406140077819810.post-80143292278652247382013-06-16T14:49:05.214-04:002013-06-16T14:49:05.214-04:00Yes -- they were among the best of the waxed-paper...Yes -- they were among the best of the waxed-paper/foil caps, but that's kind of like being the skinniest Fat Lady at the County Fair....Roberta Xhttps://www.blogger.com/profile/09956807794520627885noreply@blogger.comtag:blogger.com,1999:blog-8234406140077819810.post-26551407649150443342013-06-16T11:51:10.833-04:002013-06-16T11:51:10.833-04:00It's been my experience that the Sprague Atoms...It's been my experience that the Sprague Atoms last until they leak.I am still using a Williamson audio amp I built in the '50's and the electrolytics are fine. The Black Beauties have long since been replaced with orange drops, though. <br /><br />StrangerStrangerhttp://extranosalley.comnoreply@blogger.comtag:blogger.com,1999:blog-8234406140077819810.post-9209316772258909622013-06-14T06:49:48.429-04:002013-06-14T06:49:48.429-04:00The jumpers (there should be three) originally all...The jumpers (there should be three) originally allowed the user to select between AC and battery supply and still have benefit of the off-on switch in either mode. 9 - 12 and 1 - 3 connect the switch to the transformer in AC mode, and 4 - 6 complet the heater circuit between tubes and transformer. Presumably in battery mode, there's a jumper between 9 - 11 and B+ connects to pin 7, B- to 11, while 5-6 are jumpered and heater ("A Battery") voltage connects to 3 and 8. ...Or at least it worked that way until a later user jumpered the equipment side of the connector. Roberta Xhttps://www.blogger.com/profile/09956807794520627885noreply@blogger.comtag:blogger.com,1999:blog-8234406140077819810.post-42226417933103251082013-06-14T01:19:12.534-04:002013-06-14T01:19:12.534-04:00Thanks for the photo. One of my very first home b...Thanks for the photo. One of my very first home brew projects was a single tube amplifier to convert a HI record player to a stereo . . . . kinda miss the tube days. Nice job on the schematics.eiaftinfohttps://www.blogger.com/profile/13595068743383767561noreply@blogger.comtag:blogger.com,1999:blog-8234406140077819810.post-63735927304656100052013-06-14T00:07:49.652-04:002013-06-14T00:07:49.652-04:00Nice!
What do you suppose is the purpose of the ju...Nice!<br />What do you suppose is the purpose of the jumper between pins 9 & 12?Turk Turonhttps://www.blogger.com/profile/02648721047835980871noreply@blogger.comtag:blogger.com,1999:blog-8234406140077819810.post-37790542160023924392013-06-14T00:00:44.027-04:002013-06-14T00:00:44.027-04:00I was never fond of that, except for very complex ...I was never fond of that, except for very complex things. Besides, if you drew it, you knew it.Roberta Xhttps://www.blogger.com/profile/09956807794520627885noreply@blogger.comtag:blogger.com,1999:blog-8234406140077819810.post-1711131401051337832013-06-13T23:28:32.110-04:002013-06-13T23:28:32.110-04:00You forgot the colored pencils or felt tip pens to...You forgot the colored pencils or felt tip pens to "creative Color" the ckt as to B+, GND, Signal path.C-90noreply@blogger.com