Part 2. The R209/2/B Reception set. In this video, I finally cure the fault on this lovely communications receiver. Hopefully, there won't be a part 3!
@@TRIPPLEJAY00 it certainly is a lovely Radio. More videos coming soon.. in fact, I’ve just been given an HRO receiver. I shall be working on that next.
Geeeez Ray! You've brought back a lot of my early school memories from the 50's' with that black board.. Great to see that you stay 'traditional'. And as for the cap, don't be too hard on yourself. I suspect some of us have done something similar when attending old equipment. Easy to say, 'well, it works so I will attend to it later'.. So, one more addition to the receiver collection on your bench. Let us know how it performs against the more modern equipment. Thanks for making the video. 73's
As allways Ray very interesting and informative posts as for quick change modulation i think i preferred the first shirt in part one seriously though allways a great pleasure to watch . Take care my friend Shaun
I am always inspired by money/parts saving techniques in the old valve B/W TVs of the 60s. The saving of a phase splitter and input transformer was a great moment for the bean counters of the day. Its an interesting radio for sure.
Ray, well done! I am being challenged by a Pierson KE-93 communications mobile receiver, circa 1955. It happens to be very rare. Your videos always inspire me as I follow you along the way, Ray! Your blackboard is okay by me, and I disagree, you are a great presenter and teacher! 73's, Dave, NS8S
Hi Dave, great to hear from you. Glad you like the videos... and the blackboard! Good luck with the Pierson KE-9. Let me know how you get on. Cheers, Ray.
Welcome to the "over 50" Ray! I totally get why that cap derailed the repair. That was a great explanation of the push-pull audio stage. Many of the "kids" have never seen how tubes work, so what may be obvious to you isn't to some of the viewers and the teaching part was brilliant. I hope there is a part 3 where you show us the IF alignment and what you did to repair IF xformer that was buggered. I suspect the ferrite slug is cracked and should be replaced. 73 OM
IF slugs. . You probably know of this trick already, (if it's meant to be peaked) to check slug setting without breaking seal, place another iron dustslug nearby and see if it de-tunes. Then repeat with a brass 'uhf' slug to see if it de-tunes the opposite way. That way you can check without breaking the seal. There used to be made little tester sticks that did this.
@@jagmarc Yup. Great suggestion. I've seen that in one of the radio kits I used when teaching my class. I made one of those wands years later and have it on my workbench. 73
Love your videos yes you should have been a teacher here in merica we call valves tubes when i was a kid almost every store had tube testers and we could get replacements that includes pharmacy grocery store etc would like to see the whole thing working
Thanks for these very interesting videos Ray - I love ex military kit, I've a few bits here including a WS38 which I'll be working on soon. Anyhow, a friend of mine had an R209 back in the 80's and what was interesting about it was that the IF stages had been converted to use FETs and transistors, all the more interesting because the mod looked official - the semiconductors had CV numbers as I remember. It would be interesting to find out. Anyway its performance was very lacklustre and I think ultimately it got converted back to valves!
Hi, FETS and transistors with CV numbers... that's very interesting. I'll see if I can unearth some info about that. I had a WS38 set many years ago, I wish I'd kept it. Let me know hopw you get on with it. Cheers, Ray.
Fantastic explanation Roy and the set is sounding lovely, dont think I have ever come across a 10 ohm speaker... 4and 8 yes but there you go 73s G7WBB Alan
Top pentode's G1 'gridleak' R, hadn't gone high had it? It's not drawn on the sketch (ommited for clarity?). At 9 quid a shot I'd be tempted to add clamp silicon diode to the grids
Capacitor replaced anyway, but I saw suggestion somewhere here maybe could had prevented burnout with current limit resistor etc. There is already a 1K (R47) but to get a protective current limit this way would have to increase value from 1K. Is a possibility because the audio output power is very low about 50 mW. Starves the anode at louder audio, might be annoying compression effect maybe increase C83 make sound more natural. Sacralidgious approach add a small highish VCBo PNP transistor inline used as a current limiter. It would spend all its time saturated so wouldn't have any effect , until any fault appears.
I've just looked at the schematic during CW / BFO mode I see there's a twin-T notch filter wrapped around o/p pentode V9. That'll narrow the audio bandwidth, really great for reading qrmmy CW, but for SSB its narrow sound could be grating after a while hearing it. Edit... the narrowed audio bandwidth some may attribute in error to tiny speaker, hear the difference better through phones.
Wow!!! That was a lucky find!! Intermittent components are always fun. Would it be possible to put a current limiting resistor on the cathode to possibly save the tube in the event of another capacitor failure?
@@g4nsj lol....not for at least another 40-50 years!! I've been watching your videos for about 8 years Ray and I really enjoy them!! Do you have any more "pirate" radio stories to share? My gosh I enjoy them alot!!
Ah I couldn't find this comment at first I'd left reply on another thread. Cathode resistor would be problematic but a suitable PNP transistor instead, added inline with the HT to the op transformer. PNP saturated whole time until current exceeds threshold. Anode drops, the transistor burns off the power instead saves the valve.
![Дон ДОН, Алаудинов и СБЕЖАВШИЕ из под Курска ахматовцы 😁 [Пародия]](http://i.ytimg.com/vi/dEfCf5IK26Q/mqdefault.jpg)
You can't beat the blackboard Ray. Great explanation. Thanks.
@@RK-zg4en Thanks!
I do love a military radio. Such a lovely compact radio. Thank you for sharing this moment with us Ray. Till the next video, have a lovely day.
@@TRIPPLEJAY00 it certainly is a lovely Radio. More videos coming soon.. in fact, I’ve just been given an HRO receiver. I shall be working on that next.
Geeeez Ray!
You've brought back a lot of my early school memories from the 50's' with that black board.. Great to see that you stay 'traditional'.
And as for the cap, don't be too hard on yourself. I suspect some of us have done something similar when attending old equipment.
Easy to say, 'well, it works so I will attend to it later'..
So, one more addition to the receiver collection on your bench.
Let us know how it performs against the more modern equipment.
Thanks for making the video.
73's
I certainly will let you know how it performs.
As allways Ray very interesting and informative posts as for quick change modulation i think i preferred the first shirt in part one seriously though allways a great pleasure to watch . Take care my friend Shaun
Hi Shaun, OK on the shirt! Haha! I think I agree with you. Cheers and all the best, Ray.
I am always inspired by money/parts saving techniques in the old valve B/W TVs of the 60s. The saving of a phase splitter and input transformer was a great moment for the bean counters of the day. Its an interesting radio for sure.
I suppose they saved on a valve so can't be bad!
Very interesting look into an old radio. Great stuff, thanks Ray for sharing.
@@brmelectric thanks!
Well done mate. Nice to see these old boat anchors come back to life. 73 Joe
@@Joe-KN4IFI Thanks, Joe.
Ray, well done! I am being challenged by a Pierson KE-93 communications mobile receiver, circa 1955. It happens to be very rare. Your videos always inspire me as I follow you along the way, Ray! Your blackboard is okay by me, and I disagree, you are a great presenter and teacher! 73's, Dave, NS8S
Hi Dave, great to hear from you. Glad you like the videos... and the blackboard! Good luck with the Pierson KE-9. Let me know how you get on. Cheers, Ray.
Welcome to the "over 50" Ray! I totally get why that cap derailed the repair. That was a great explanation of the push-pull audio stage. Many of the "kids" have never seen how tubes work, so what may be obvious to you isn't to some of the viewers and the teaching part was brilliant. I hope there is a part 3 where you show us the IF alignment and what you did to repair IF xformer that was buggered. I suspect the ferrite slug is cracked and should be replaced. 73 OM
Great to hear from you! Thanks for your lovely comments, that's really nice of you. There probably will be a part three at some stage. 73. Ray.
IF slugs. . You probably know of this trick already, (if it's meant to be peaked) to check slug setting without breaking seal, place another iron dustslug nearby and see if it de-tunes. Then repeat with a brass 'uhf' slug to see if it de-tunes the opposite way. That way you can check without breaking the seal. There used to be made little tester sticks that did this.
@@jagmarc Yup. Great suggestion. I've seen that in one of the radio kits I used when teaching my class. I made one of those wands years later and have it on my workbench. 73
@@jagmarc I made a wand back in the 60s. Very useful!
I like it and the explanation was good. I like the design as well - fewer moving parts so less to go wrong.
Thanks!
Thank you, Ray. Nice to see "The Master" at work. It is a quirky Radio all told isn't it.
The Master... I like that!
Love your videos yes you should have been a teacher here in merica we call valves tubes when i was a kid almost every store had tube testers and we could get replacements that includes pharmacy grocery store etc would like to see the whole thing working
I've heard of shops having tube testers. Great idea back in the good old days. Love your handle... Two Dollar Bill. Excellent!
Thanks for these very interesting videos Ray - I love ex military kit, I've a few bits here including a WS38 which I'll be working on soon. Anyhow, a friend of mine had an R209 back in the 80's and what was interesting about it was that the IF stages had been converted to use FETs and transistors, all the more interesting because the mod looked official - the semiconductors had CV numbers as I remember. It would be interesting to find out. Anyway its performance was very lacklustre and I think ultimately it got converted back to valves!
Hi, FETS and transistors with CV numbers... that's very interesting. I'll see if I can unearth some info about that. I had a WS38 set many years ago, I wish I'd kept it. Let me know hopw you get on with it. Cheers, Ray.
Ray, thanks for your great presentation of this fascinating vintage receiver. John, k0ebc
Thanks, John.
Fantastic explanation Roy and the set is sounding lovely, dont think I have ever come across a 10 ohm speaker... 4and 8 yes but there you go 73s G7WBB Alan
Hi Alan, it is an odd impedance!
Top pentode's G1 'gridleak' R, hadn't gone high had it? It's not drawn on the sketch (ommited for clarity?).
At 9 quid a shot I'd be tempted to add clamp silicon diode to the grids
All resistors checked and OK
Capacitor replaced anyway, but I saw suggestion somewhere here maybe could had prevented burnout with current limit resistor etc. There is already a 1K (R47) but to get a protective current limit this way would have to increase value from 1K. Is a possibility because the audio output power is very low about 50 mW. Starves the anode at louder audio, might be annoying compression effect maybe increase C83 make sound more natural.
Sacralidgious approach add a small highish VCBo PNP transistor inline used as a current limiter. It would spend all its time saturated so wouldn't have any effect , until any fault appears.
Great, Ray...
@@Theoobovril Thanks!
Thank you 🙏
I've just looked at the schematic during CW / BFO mode I see there's a twin-T notch filter wrapped around o/p pentode V9. That'll narrow the audio bandwidth, really great for reading qrmmy CW, but for SSB its narrow sound could be grating after a while hearing it.
Edit... the narrowed audio bandwidth some may attribute in error to tiny speaker, hear the difference better through phones.
@@jagmarc I was referring to the small speaker when listening to AM broadcast stations. The bandwidth on SSB is perfect, it sounds great.
@@g4nsj great for CW A1.
Don't worry Ray, I've done things like that before. But you're excused, I'm also not familiar with this kind of capacitor behavior.
73 de Bernd
@@berndb.5097 Thanks! Great to hear from you.
TNX RAY what was the heaters voltage just a matter of interest 73 de G6JMX
1.5 volts, I believe.
Wow!!! That was a lucky find!! Intermittent components are always fun. Would it be possible to put a current limiting resistor on the cathode to possibly save the tube in the event of another capacitor failure?
Good idea. I have replaced all caps now so, hopefully, no more problems.
@@g4nsj lol....not for at least another 40-50 years!! I've been watching your videos for about 8 years Ray and I really enjoy them!! Do you have any more "pirate" radio stories to share? My gosh I enjoy them alot!!
@@hitekredneck109 Glad you like the videos. I hope to be working on some pirate radio videos soon.
Ah I couldn't find this comment at first I'd left reply on another thread. Cathode resistor would be problematic but a suitable PNP transistor instead, added inline with the HT to the op transformer. PNP saturated whole time until current exceeds threshold. Anode drops, the transistor burns off the power instead saves the valve.
@@jagmarc Great, thanks!
Capacitor capacitor capacitor resistor resistor resistor the life of being a (tube) lol
@@jodylaneyAA4XT Indeed! 👍😂
Hi Ray have you seen YTer Bedtime stories "The Curse of Clapham Wood"?
I've not seen that. I'll look out for it. Thanks!