Ham Radio: Drake PS7 Power Supply Clean, Tune, and Test
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- เผยแพร่เมื่อ 8 ก.ย. 2024
- Let's take a close look at the Drake PS7 supply for the TR7 Transceiver.
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Yes, as others have mentioned the "nails" are standard shroud retainers on classic Jones connectors ("Cinch" is a brand name, "Jones" is the style of connector) and they won't come out on their own because of the twist. Your main filter caps will last forever with that optional fan pulling air out across them. The PS7 is a very reliable beast.
I was searching the Internet for a way to fix a noisy fan in the PS7; mine growls for a short time until it runs for a bit. I have never had the cover off of my PS7, but after watching this video, I am going to do it and see if it needs the dust blown out of it as well. Thanks for this video and I will be looking to view your other Drake videos too. Thanks again
Glad you enjoyed this!
Remembering my Elmer's upgrade to a drake tr7 in 1982. Cool to see retro radio gear and you bringing it back to life!
Thanks! Its a fun project for sure
The black caps on the pass transistors are likely there to prevent accidentally shorting the collector of the transistor to ground. That would be BAD.
The threaded studs were factory cinch jones connector studs. You simply screw them in with a pair of needle nose pliers. 73 Doug.
Good common sense video. I have the tr4c rv4c mn2000 and just acquired the tr7 ps7 Late serial # . Love the Drakes
Nice video - an inspiration to take my 40 year old TR7A PS outside for some canned also. Have used the rear panel 13.8V tap to supply the SP75 processor. Over the past 30 years I have turned the PS/radio on using an external power strip. On/Off volume pot is essentially “unobtainium” - Many TNX and 73 - KB3H
Same with tr4 line of radios, power strip was recommended by drake tech back in 2011 as those pots were getting hard to find
Super clean. Those are not nails, they are actually pins that hold the housing on the connector. If you look at the other connector or a new connector you should see the same kind of pins. Keep up the good work. 73 de N6LPV
My other connector has screws in it so someone must have already replaced the pins
When I got my TR7/PS7 back in the late 1990s, I did two things. First, I sent the TR7 off to Miamisburg for a complete service. They tuned it up, replaced a few components, updated it to TR7A specs and burned it in for several days before sending it back to me. It was one of the last of the 7 line radios they services as I got a letter a few weeks later notifying me that support was ended for the line. The second thing I did was to buy a complete set of spare connectors and their opposite genders. I have an on/off switch wired up to control the PS7, it’s simple. The real trick will be to find the connectors. That twisted nail is the correct fastened for the wire hood, all mine have them.
That drake looks like it is in really clean and good shape for its age. Good video. Looking forward to next one!
The "twist nails" are part of the that chinch jones connector just fyi.. They work well.
Enjoy the older equipment. Waiting for the next video on the radio. Thanks. KJ6DQ
Nice, that's cool
Nice update 😊
That is one beefy power supply.
Looking forward to the next video.
73s
I wish I knew more about electronics like you do. My training in diesel mechanic trade school was limited to electromagnetics and some simple electronics such as diodes, transistors and capacitotrs. I need to take an online class somewhere. I know Mr. Carlson's Lab has a $$ a month subscription to get access to some of his training videos. I don't think it's too expensive as I recall.
I wish I knew more myself....I'm just a hack for 5he most part
@@SevenFortyOne I just checked there are three levels you can do on Patreon to get some training from Mr. Carlson. $2, $5 and $10. I might do this someday after I get some of my projects done and out of the way. I have that Ford Tractor that I want to get done.
Love the Drake line! Nice video Sir!
No surprise inside! This is a good thing considering it's a power supply and not a box of cracker jack! Looks well cared for! 73's de KC2RDU
While this post is a bit old, those black covers on the transistors are NOT for cosmetic reason. Drake put them on because the collector of the transistors (the case) are connected to the filtercaps/bridge rectifier/transformer, and there is about 22ish volts sitting on those transistor cases. Should a wayward coax connector touch one of those un-protected transistor cases, you'd have big sparks, lots of smoke, and now a broke PS7.
I guess I never stopped to think about it but that makes perfect sense now that you explain it. Now I have to wonder why Astron doesn't add covers on their supplies since they are using a similar type of pass transistors with "hot" collectors. I guess maybe since theirs are generally on the back they don't feel its as big a risk of shorting out?
Some of the Astrons did have the protectors in place. Ditto the Heathkit HP1144 (used for their SB104 transceiver). On some Ten Tec power supplies, they installed an aluminum metal bracket across the transistors (of course not touching them) to keep wayward things from touching the collectors. @@SevenFortyOne
I'm re-capper. I'd prefer to do that than have an old cap fail just at the wrong time -- and large cap explosions make a nasty mess.
(BTW: Your stapler takes me back to my father's office in the early 1960s, where he had the exact same model.)
That stapler came from an arospace company I work for. On the handle there is a engraving of "chief" . It's a neat piece. I need to bring it back to work...I brought it home to fix it
Is the vox relay on the back of the power supply a key in circuit?
You're too young to know this.. but them thar pins are not nails. They belong there. Like you said, if it aint broke, don't fix it. Now the next knowledgeable, (preferably, old school owner,) is gonna wonder who's been monkeyin with this equipment.
Yep - I'm just another Millennial (well, I'm actually a Gen-Xer) ruining ham radio. Thanks for watching, I'm glad you enjoyed the video!
@@SevenFortyOne I really did!. and as one of your regular subscribers that includes the alert bell..... I usually do. Don't feel bad, though this is becoming more common. I simply suggest to all interested in boat anchors and any restoration you may be contemplating.. just be a little more careful and do more in depth archaeological research before committing to any alterations that may be of value to a boat anchor purist like you. Like I've been known to do myself, ship it off to a pro if you're in over your head. I would not want to be the last caretaker of this gear. I personally would feel sick to my stomach for a long time being the one to offer up and commit the chassis of my Drake station to the sea of landfill.
73
Ok - got it. Thanks for the constructive criticism and support.
love your videos, keep em comin! KN4SXS
Are you like an electrical engineer...or it's just a hobby?
Both...sort of. I'm in the electronic design and manufacturing field for work. I'm not a circuit designer but I have a little bit of knowledge on how circuits should work.