Fixing Roberts r700 radio - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 15th March 2011, 09:43 PM   #1
diyAudio Member
 
Join Date: Mar 2011
Talking Fixing Roberts r700 radio

Hi all, I am a new member and have just started trying to fix an old Roberts Radio. I wonder if anyone can help me? I am after circuit diagrams/service information of a Roberts radio type r700? If not are there any fm receiver circuits from other manufacturers that might use the af180 and af114 germanium transistors available? Perhaps these circuits could give me a push in the right direction (by the way the FM is dead on this radio!) Thanks.
  Reply With Quote
Old 16th March 2011, 01:22 AM   #2
burbeck is offline burbeck  United Kingdom
diyAudio Member
 
Join Date: Aug 2004
Location: Ratae Coritanorum
hi valvesrock
someone on this site may help you UK Vintage Radio Repair and Restoration

these radios were great worth the effort.
transistors types AF114/5/6/7 with the 4 connections have a bad habit of going short between collector case and screen, if this happens snip the screen connection usually works.
__________________
regards
bob
  Reply With Quote
Old 17th March 2011, 12:32 AM   #3
diyAudio Member
 
indianajo's Avatar
 
Join Date: Jan 2010
Location: Jeffersonville, Indiana USA
Any electronic device between 20 and 40 years old needs all the electrolytic capacitors replaced. These look like oil tanks for model trains, covered with cardboard or plastic cover with a plus on one end or a minus on the other. If your unit doesn't have tubes (valves in UK) then it shouldn't have any upright aluminum can electrolytic caps with 2-4 sections. These would need replacing,too. I recapped a 1980 radio I inherited from my father, and it works pretty well. It has better sensitivity than the pocket Sony FM radio I bought 3 years ago. I didn't have a schematic.
__________________
Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,1.3K, SP2-XT's, T-300 HF Proj's, Steinway console, Herald RA88a mixer, Wurlitzer 4500, 4300
  Reply With Quote
Old 20th March 2011, 09:37 PM   #4
gpapag is offline gpapag  Greece
diyAudio Member
 
gpapag's Avatar
 
Join Date: Nov 2002
Location: Athens-Greece
Hi valvesrock
You've got PM (Private Message)
On the top right of this page, under your user name, click on the "Private Message")

Regards
George
__________________
["Second Law is a bitch." - SY] ["The Road To Heaven:Specify the performance & accept the design. The Road To Hell:Specify the design & accept the performance"-Bruno Putzeys]

Last edited by gpapag; 20th March 2011 at 09:40 PM.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pioneer CS-R700 horn speakers limono Swap Meet 1 27th March 2009 02:44 PM
Modding Roberts/Akai mono block tube amps limey222 Tubes / Valves 4 2nd December 2006 08:50 PM
Roberts/Akai M series amp problems wboyd Tubes / Valves 3 1st December 2005 04:49 PM
Samsung AV-R700 service manual wanted! stef1777 Digital Source 3 18th October 2005 04:23 PM
John H. Roberts DIY project in 1985 Audio Magazine coolohm Parts 0 28th June 2002 06:28 PM


New To Site? Need Help?

All times are GMT. The time now is 07:34 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2