Hello again and thank you for another video .I like your construction, excellent work. I built a regen receiver a while ago. It used a 6u8 with the regen pot to control the screen grid voltage. I followed that with a 6gv8 audio output tube. I didn't have an output transformer so I used a transformer from a 5 volt plug back. That gives a voltage ratio of 48 which equals the turns ratio. So squaring that 48 gives an impedance value of about 2300 ohms which while not ideal is an acceptable load for the 6gv8. I agree with your comment about sourcing old components. They can be impossible to find sometimes which led me to the plug pack transformer. Kind regards Clare
Thanks for the comments. I just saw this particular circuit and had the urge to make it using an old chassis I had to hand, but had to make the box myself... Sadly I'm not very good at that side of things! Yes in the 'old days' one was able to buy the right impedance transformer for a particular valve, but now I usually find myself compromising. However, I'm not sure that the ones I end up using would be as close with their matching as yours clearly is. ( I must try using something like you did to see how well it works.)
Whilst a lot of the larger short wave stations such as the 'real' BBC World Service and The Voice of America have long gone, there are still plenty of foreign stations out there with a regular English speaking slot to be found. Let's also not forget that there are several pop music stations as well, such as Radio Mi Amigo, KBC Radio etc. etc :-)
This is really nice. We listen to shortwave here in Canada. We also have a lot of medium wave stations as well as some hams that still like to operate AM. Thank you for sharing some of your knowledge with the rest of the world.
Thanks for the positive comments. Sadly the UK is becoming very 'dead' on Medium Wave, with operator after operator deciding to stop broadcasting on these frequencies. Towards the end of 2023, our BBC is still methodically closing down all of their local MW radio stations etc. Our last 'vestige' of the real Britsh Broadcasting Corporation is Radio 4 (the old 'Home Service') which is currently still broadcasting on Long Wave 198KHz and they are planning to shut this down in the next year or two. This amazing service can still be heard right into Europe. Such a pity for those who still listen on these frequencies.
Tried SP61s in an attempted TV back in 1966. Timebases were OK but vision receiver gasped and hissed. Finally had success with EF91s two years later; more compact and SP61 is 'greedy' with its 0.6A heater.
Interesting! In my experience the SP61 (VR65) varies from sample to sample. For this project I actually used the SP41 which is the 4V 1A heater variant as I had a few in a box wanting using. Several had 'instability' type issues until I finally found a good one. I believe that they were actually quite advanced when introduced and ran reliably at significantly higher frequencies than most of their counterparts from that time.
Thanks for the comment! Yes, works surprisingly well as you can hear of course. Oh BTW - love the split screen Morris :-) We've had several Morrisses over the years..
You're welcome! I had been meaning to put this one up on RUclips for a long time and it was only when the set was in bits to replace that resistor that I thought of finally making one :-)
Nice. I still like valves. I wish Denco products and especially coils were still around. I bought some PM2 type valves at rallies and want to make a replica one valve H.A.C. like when I built one aged 14. Valves and 90 Volt batteries became unavailable so I took it apart for parts. I wish I hadn't. The green Denco number 3 coil is in my Wireless 19 Set to tune the input on receive. G4GHB
Interesting! I've been collecting 'old' valves and valve interstage transformers, tuning caps etc. to maybe one day build a 1920s-look-valve set. As far as HT batteries are concerned, I 'plug together' multiple cheapy PP3s until I reach the voltage I want. Agreed about the coils. Such a shame that there are so few Denco's around today and those which are, always attract a ridiculously high price.
@@lishaton Hi, yes I did that for a Pye portable mw/lw set requiring 90 Volts.and an h/b inverter for my much modified Wireless 19 Set.after removing the two remaining B Set valves..
Hi José! Glad you like it :-) Unfortunately I don't think it would be an easy job to incorporate such a device. This sort of extra is usually incorporated into superhets using the AVC line. As this is a regen TRF, I fear it might be difficult and I'm really not sure how one would start. (Maybe someone reading this could give us some clues??)
Hello again and thank you for another video .I like your construction, excellent work. I built a regen receiver a while ago. It used a 6u8 with the regen pot to control the screen grid voltage. I followed that with a 6gv8 audio output tube. I didn't have an output transformer so I used a transformer from a 5 volt plug back. That gives a voltage ratio of 48 which equals the turns ratio. So squaring that 48 gives an impedance value of about 2300 ohms which while not ideal is an acceptable load for the 6gv8. I agree with your comment about sourcing old components. They can be impossible to find sometimes which led me to the plug pack transformer. Kind regards Clare
Thanks for the comments. I just saw this particular circuit and had the urge to make it using an old chassis I had to hand, but had to make the box myself... Sadly I'm not very good at that side of things!
Yes in the 'old days' one was able to buy the right impedance transformer for a particular valve, but now I usually find myself compromising. However, I'm not sure that the ones I end up using would be as close with their matching as yours clearly is. ( I must try using something like you did to see how well it works.)
very interesting build. I remember tuning my radio like this at night and listening to far off stations
Whilst a lot of the larger short wave stations such as the 'real' BBC World Service and The Voice of America have long gone, there are still plenty of foreign stations out there with a regular English speaking slot to be found. Let's also not forget that there are several pop music stations as well, such as Radio Mi Amigo, KBC Radio etc. etc :-)
This is really nice. We listen to shortwave here in Canada. We also have a lot of medium wave stations as well as some hams that still like to operate AM. Thank you for sharing some of your knowledge with the rest of the world.
Thanks for the positive comments. Sadly the UK is becoming very 'dead' on Medium Wave, with operator after operator deciding to stop broadcasting on these frequencies. Towards the end of 2023, our BBC is still methodically closing down all of their local MW radio stations etc. Our last 'vestige' of the real Britsh Broadcasting Corporation is Radio 4 (the old 'Home Service') which is currently still broadcasting on Long Wave 198KHz and they are planning to shut this down in the next year or two. This amazing service can still be heard right into Europe. Such a pity for those who still listen on these frequencies.
Tried SP61s in an attempted TV back in 1966. Timebases were OK but vision receiver gasped and hissed. Finally had success with EF91s two years later; more compact and SP61 is 'greedy' with its 0.6A heater.
Interesting! In my experience the SP61 (VR65) varies from sample to sample. For this project I actually used the SP41 which is the 4V 1A heater variant as I had a few in a box wanting using. Several had 'instability' type issues until I finally found a good one. I believe that they were actually quite advanced when introduced and ran reliably at significantly higher frequencies than most of their counterparts from that time.
Excellent work.
Thank you! :-)
Great valve project 👌 👏
Thanks for the comment! Yes, works surprisingly well as you can hear of course. Oh BTW - love the split screen Morris :-) We've had several Morrisses over the years..
Another great video. Thank you, RR! 😀😀
You're welcome! I had been meaning to put this one up on RUclips for a long time and it was only when the set was in bits to replace that resistor that I thought of finally making one :-)
Nice. I still like valves.
I wish Denco products and especially coils were still around.
I bought some PM2 type valves at rallies and want to make a replica one valve H.A.C. like when I built one aged 14.
Valves and 90 Volt batteries became unavailable so I took it apart for parts. I wish I hadn't.
The green Denco number 3 coil is in my Wireless 19 Set to tune the input on receive.
G4GHB
Interesting! I've been collecting 'old' valves and valve interstage transformers, tuning caps etc. to maybe one day build a 1920s-look-valve set. As far as HT batteries are concerned, I 'plug together' multiple cheapy PP3s until I reach the voltage I want. Agreed about the coils. Such a shame that there are so few Denco's around today and those which are, always attract a ridiculously high price.
@@lishaton Hi, yes I did that for a Pye portable mw/lw set requiring 90 Volts.and an h/b inverter for my much modified Wireless 19 Set.after removing the two remaining B Set valves..
there is a article on line for making replica denco coils from around about the mid 90's short wave magazine.
@@roberthorseman7432 Yes, I've seen various articles.
Beautiful project! What would it take to put a signal meter using a magic eye tube?
Hi José! Glad you like it :-) Unfortunately I don't think it would be an easy job to incorporate such a device. This sort of extra is usually incorporated into superhets using the AVC line. As this is a regen TRF, I fear it might be difficult and I'm really not sure how one would start. (Maybe someone reading this could give us some clues??)