UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Radio (domestic)

Notices

Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only.

Closed Thread
 
Thread Tools
Old 10th Dec 2018, 1:47 am   #1
Herald1360
Dekatron
 
Herald1360's Avatar
 
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,526
Default Interesting early French Transistor Radio

The set I described in my RWB post as a "rather sad early French tranny" is actually rather interesting. It's from around 1960 and appears to be a Technifrance TR85 or perhaps TR8-85. It has 8 transistors, separate mixer and oscillator, two IFs, preamp, driver and a p-p pair. It covers 5 bands, LW, MW and 3 SW covering 3-24 MHz. It has patina a bit to excess, but internally apart from a very rusty 6*D battery tray it doesn't look too bad. All the transistors are socketed (which may be a contact cleaning nightmare) and the chassis and tagstrip construction looks very neat and should be reasonably accessible once out of the cabinet.

Helpfully, doctsf has a promising looking circuit for a TR8-84 model together with comments about various versions differing only in their waveband coverage. My set has a helpful table listing various manufacturers' transistor types as suitable but I suspect if any are dead, apart from the front end types (which I reckon my Russian AF124 subs could replace) the usual Mullard OC types would do nicely.

Watch this space (don't hold your breath, though ).
__________________
....__________
....|____||__|__\_____
.=.| _---\__|__|_---_|.
.........O..Chris....O
Herald1360 is offline  
Old 10th Dec 2018, 12:39 pm   #2
Mike. Watterson
Heptode
 
Join Date: Dec 2014
Location: Limerick, Ireland.
Posts: 901
Default Re: Interesting early French Transistor Radio

Sounds like a good SW model.
Some much later Sony models used separate LO and Mixer. Better performance at higher frequencies. One also used part of FM IF strip as AM IF, and then another mixer transistor at final FM IF to down-convert to 455KHz.
Actually some Schaub battery Valve sets used 6.5MHz FM IF amp and then conversion to regular AM IF frequency.
The Vidor AM/FM valve portable has no DK96 AM mixer/osc. The FM Mixer osc is the AM LO and the FM first FM IF is the AM pentode mixer. So entire RF & IF on AM and FM is all DF97 valves. Semiconductor FM detector, DAF96 is AM detector and audio preamp.
Mike. Watterson is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 2:07 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.