Grundig 97 (Techniek Radio/TV)
door Mike Horne 
, 07.04.2014, 13:06 (3886 dagen geleden)
Hi. I have a Grundig 97 a.m/ukw radio (red plastic cabinet)that I am currently restoring. It has had a "hard life", the metal rod (under chassis)has come adrift (one part is connected to the bar that the push buttons are connected to, but I am not sure about the other part & where it is fixed to).
The gain is very low on a.m bands (resistors, caps & tubes all have been checked, and metal rectifier too). It is as if the machine is switched to pick-up for record player connection).
Has anyone got more information on this radio (under chassis views, etc). I have only the basic schematic?
Is there a circuit difference between 97 and 97B (latter info marked on ukw tuner box)?
Cheers
Mike (U.K)
Grundig 97
door Adelbert , 08.04.2014, 12:05 (3885 dagen geleden) @ Mike Horne
Hi Mike,
I can help you with real manuals, this service is free.
If this helps.......
Best regards,
Adelbert
Grundig 97
door Mike Horne , 09.04.2014, 11:24 (3884 dagen geleden) @ Adelbert
Hi Adelbert. Many thanks for your reply (much appreciated).As I mentioned, there is a metal rod underside with a bracket coming off at an angle. One probably went to the switch bank frame, but I am not sure where the angled one went to.
I managed to get the a.m band (middengolf) working really well, the capacitor to G2 of EF89 tube was connected wrongly. The other a.m bands do work, but it is the u.k.w band that does not work (no hiss noise). There is writing on the u.k.w tuner saying 97B, but I am not sure if this is correct for my receiver?
My tube line up is ECC85, ECH81, EF89, EABC80, EL84, EM84, the metal rectifier has been replaced with a silicon bridge and resistor.
The long wave ferrite coil has been flattened a bit, not sure if I require replacement (I certainly could not rewind it)
Cheers
Mike
Grundig 97
door John Hupse † 
, Schoonhoven, 08.04.2014, 13:14 (3885 dagen geleden) @ Mike Horne
Is there a circuit difference between 97 and 97B (latter info marked on ukw tuner box)?
The Grundig 97 is from 1957, the Grundig 97a and 97b are from 1960. Yes, there are a number of differences, you will find the correct documentation for the 97, the 97a and the 97b models at http://www.nvhr.nl/schema.asp
There are also a few minor differences between the Grundig 97a and the Grundig 97b, these are documented by Grundig in the part list (Ersatzteil-liste) of the corresponding documentation:
![[image]](images/uploaded/201404081505015344101ddfbd8.gif)
A 'x' means 'present', a '-' means 'not present'.
Grundig 97
door Mike Horne , 12.04.2014, 08:56 (3881 dagen geleden) @ Mike Horne
Hi. The Grundig 97 manual does not illustrate mechanical layouts such as the locations of the metal bar that activates the u.k.w tuning. When the set is switched to u.k.w, both this and the a.m pointer move, but only the u.k.w pointer should be moving on this wave band. Can anyone help, please?
Kind regards
Mike
Grundig 97
door Mike Horne , 16.04.2014, 11:23 (3877 dagen geleden) @ Mike Horne
Hi. I have managed to make some progress with the mechanical problem. The metal rod that fits in to the side of the under chassis (near the tuner knob)had come adrift from where it should be, the long piece fitted on the spindle on the push button frame, the ratchet end fitted through a hole in the u.k.w tuner button shaft. This stopped the a.m tuner pointer moving at the same time as the u.k.w pointer (when switched to the latter band).
Still no u.k.w hiss noise yet.
Grundig 97
door Mike Horne , 19.04.2014, 07:52 (3874 dagen geleden) @ Mike Horne
Hi. Further progress has been made on the 97 radio, I have found that when it is switched to ukw, the audio amplifier seems to be disconnected (no hiss or noise from the speaker, normally there should be a loud noise heard in the loudspeaker when the volume control terminal is touched, but this only happens when the radio is switched to the a.m bands. Can anyone help, please?
Cheers
Mike