You had great experience with radios. For linsting far mw stations which radio performed best. Thanks for nice vedios. Very few people in India have that technical knowledge of radio's..
मैने 1971 मे मैने ट्रेनिंग के दौरान 4 वॉल्व,6 वॉल्व टाइप रेडियो और डबल ट्रांसफार्मर (ड्राइवर व आउटपुट) वाला L Bord एवं C टाइप बोर्ड पर ही इलैक्ट्रोनिक की ट्रेनिंग ली थी। इस बोर्ड में भी कुल 7 जर्मेनियम ट्रांजिस्टर लगते थे। आउटपुट मे दो AC128, ड्राइवर मे दो AC125, IF मे दो AF 117, कनवर्टर मे AF114 लगाया जाता था। ये सभी इंपोर्टेड जर्मेनियम ट्रांजिस्टर थे सिलिकॉन ट्रांजिस्टर नही आए थे।😢
Dear sir आप काफी senior है मुझसे ,आपको मेरा अभिनंदन है। उस समय के अच्छे रेडियोसेट में RF amplifier भी अलग से होता था जिससे दूर के स्टेशन बहुत साफ और तेज बजते थे। ये philips के valient वाल्व रेडियो में और कुछ सॉलिड स्टेट के सेट्स मेंमैंने देखा है। बाद में jolly ने चार बैंड के रेडियो मेंRF amlifier ic use किया। जो बहुत ही अच्छा था
@@MKElectronics306 Please aapka number share karna hai to mujhe kijiye. Kuchh ideas Lena hai. Aap bahut senior hai isiliye aajkal aise technical knowledge rakhne wale asani se nahi Mila karte. Mere pass od valv radio U-series, National EKCO, Telerad jaise repair Kiya tha jo apna father ke jamane ka tha. LT Resistance wala UY85 rectifier valve. Aur ek tha Transformer AC wala UCL82 output Valve wala Bush Radio. Mujhe circuitry ka Gyan lene hai.
Rajshekhar ji Namaskar Bahut Khushi mili meri purani yadein taja kardi. AF115 117 1980's mein bhi munh manga rate lete the. Ab woh jamana nahin raha. Par woh set jiske bhi paas hai, jab Tak chhed chhad nahin karoge to kabhi kharab nahin hota tha. Koi baat nahi please aap ho sake to contact no. Share karen to koi jankari milegi. Hat's off....
Sirji, purana yaad taza kar diya. Great job. Abhi bhi mere paas hai. Par agar Coil, IFT, Band switch, ferrite rod, BF195D, BF194 agar milega to mein banana chahoonga. Pehle Hitachi, coil, Stancore, Vision ka ata tha. Abhi milega kya?
Sirji namaskar Isitarah ek L board ate tge jisme direct detector ift 3rd wale se 810 ic pin noo. 8 ko jaate the. Use bhi krupaya hoga to load kijiye ya mere paas bhi ahayad blank pcb hoga. Par dhoondna padega. Acar kahin par UFT aur Coils milta higa to please batana.
Very nice information Sir! I have 2 sets having pair of Germanium transistors, one of AC 187/188 and other AC 127/128. AC 187 188 circuit has transformer applied before them. Sir, can I get AC 187 188 matched pair transistors with or without heat sink? I tried in local market.. But not available. Many of the dealers even don't know about Germanium transistors..! The set which I have, the transistors have become weak. So sound quality is not like original. Please guide me if possible. Thanks. 🌹👍🏻🙏🏻
Dear, Now days germanium transistor is not manufactured. You can replace with silicon transistor, but you have to change the value of resistance. Only delhi lajpat rai market you can search but I am not sure that it will available or not. In which radio set you have these transistor. Write model no and name Because in some radio sets also output input transformer used in audio section,
Thanks for response. I have BUSH Radio cum Tape Recorder MONO Model MRK 5200, in which matched pair of Germanium Transistors AC 187 188 is used. Actually due to wear and tear, one leg of one the transistors got cut from it's bottom. I tried fixing it thru small stapler pin vertically fixed over it and soldered then with high care placing the transistor in wet cotton while soldering.. It's working for now. But original quality has gone down a little bit..!
