G4NSJ - National HRO 5TA1 5A1 comms receiver - part three

[@julianrobertson3303]

Thank you for sharing Ray , it's all marvellous as always .73

[@g4nsj]

@@julianrobertson3303 Thanks!

[@edwardholland36]

Enjoying this series here, Ray. To answer your question, I've restored some US domestic sets from the 1930s. The term 1st detector was used quite commonly for a valve working solely as the mixer (with a separate valve as oscillator) as 1st detector/Osc, where valves like the 6A8 combined both functions. It is a strange term to we Brits! Looking forward to more of the story. 73

[@g4nsj]

@@edwardholland36 That’s interesting. Thanks for the info. More videos coming soon. Cheers, Ray.

[@MirlitronOne]

Hi Ray Having just refurbished / "updated" a 1960s Codar CR45 regen receiver (two valves + rectifier) with great success, I think I'll quit while I'm ahead and leave complicated stuff like this HRO to experts like you!

[@g4nsj]

@@MirlitronOne Don’t quit! Well done either way the Codar. Keep going! Cheers, Ray.

[@ZAR797]

Fascinating Ray. Please keep the updates coming. From ZS land

[@g4nsj]

@@ZAR797 More updates soon! 👍😃

[@G4WTV]

Hi Ray, sorry I gave you such a challenge, but it sounds like you are enjoying fixing it. I’m also very pleased that you are making progress. I have no idea what the previous history is for the radio, but my son-in-law and I went to look at a vehicle that he was interested in buying. Next to it was a very beat up old van, inside were two old valve radios and this is one of them. When I expressed an interest in it, the owner told me to take it, otherwise it was going to the local council tip. All the best, Roy - G4WTV

[@g4nsj]

@@G4WTV Hi Roy, it’s a great radio. I like a challenge so don’t be sorry. It’s going to be a real gem when it’s finished. I’ll keep you posted. Cheers, Ray.

[@TwoDollarBill000]

Thanks for the journey. Keep it up!

[@g4nsj]

@@TwoDollarBill000 More coming soon. 👍

[@ChuckKirchner-se6ib]

Hi Ray, Yank here. I've been fixing all sorts of radios since 1966, and I've not heard of 1st Det/2nd Det. I have always called your 1st Det "The Mixer", also, and in some cases it's a mixer/oscillator (1R5 for instance). Perhaps it's just a National term, as they were a bit weird. Cheers, mate. Oh, I had a look at all my pots and the 10Ks I have are all screwdriver adjust carbon track units. Sorry.

[@g4nsj]

@@ChuckKirchner-se6ib Hi, thanks for checking your pots. I’ll find one eventually. The term ‘detector’ might well be a national HRO term. I’ll carry on calling it a mixer. Cheers, Ray.

[@WECB640]

Hi Ray. I wonder if "1st detector" is an RF wideband sample used for noise blanking. Just a thought. PS. The camera didn't pick up the wet shirt spot until you mentioned it. Better to have egg on ones shirt, than on the face. 73 M8

[@g4nsj]

@@WECB640 good thought. I needn’t have mentioned the shirt after all! 🤣

[@michaelcole2175]

Pleased to hear I'm not the only one with NAFFI Gongs !

[@g4nsj]

@@michaelcole2175 👍

[@AdamDeal-KF0PRI]

very nice work! its very frusterating haveing to find that someone dinked up the radio! like to just smack them around lol!

[@g4nsj]

@@AdamDeal-KF0PRI 👍🤣 Happy days!

[@Theoobovril]

Ray, when convirting from 6V to 12V heaters, would the H.T. need to be changed too, so to suit that for the 12V valves.

[@g4nsj]

@@Theoobovril The HT can stay as it is, no need to change it. The valves are identical, apart from the heater voltage, Cheers, Ray.

[@mikesmithg0rfd356]

i hope these two youtube videos help a bit

[@g4nsj]

@@mikesmithg0rfd356 thanks, Mike. That’s very useful. Cheers, Ray..

[@mikesmithg0rfd356]

the audio amp should be a 6v6

[@g4nsj]

@@mikesmithg0rfd356 That’s right. I’ll be looking at the audio stage next. Cheers, Ray.

[@mikesmithg0rfd356]

kzbin.info/www/bejne/omHcinWlnsZ_l5I

[@g4nsj]

@@mikesmithg0rfd356 Thanks, Mike!