Some pics would be good Graham....
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BeoGram 6000 - Tonearm/Tracking problem
22 replies
Sorry guys - been a bit busy, working a different turntable (65 ft diameter)..
I'll post a couple of pix, hopefully tomorrow (Monday)
I'll post a couple of pix, hopefully tomorrow (Monday)
Location: Cornwall, UK
Obtained HND in Electronics Engineering in 1982.
Retired in 2016, and am still 'tinkering'. Have had my Beogram 4000 and BeoMaster 1900-2 since 1984.
Retired in 2016, and am still 'tinkering'. Have had my Beogram 4000 and BeoMaster 1900-2 since 1984.
Here are some pictures ! TR22 was u/s, so changed it out while replacing the Tantalum capacitors.
I also switched out the supply filter capacitors (old electrolytic) - for 2 separate new electrolytics (The 4000uF was replaced with a 4700uF at this point).
All back together and working (ish) - Still need to fix my BeoMaster 1900 !!
I also switched out the supply filter capacitors (old electrolytic) - for 2 separate new electrolytics (The 4000uF was replaced with a 4700uF at this point).
All back together and working (ish) - Still need to fix my BeoMaster 1900 !!
Location: Cornwall, UK
Obtained HND in Electronics Engineering in 1982.
Retired in 2016, and am still 'tinkering'. Have had my Beogram 4000 and BeoMaster 1900-2 since 1984.
Retired in 2016, and am still 'tinkering'. Have had my Beogram 4000 and BeoMaster 1900-2 since 1984.
Congrats!
"WISE GUY MOD ON":
When you used shrinking tube at the reservoir caps, why did you not put it over the soldering?
It's a 4700 uF, keeps a lot of power inside when you touch chassis ZAPP!, don't ask me why I know ;-))
I'm missing the clamp for the cap, maybe with some feltpad underneath to get it tight fit.
I would have mounted new pots on the mainboard while I have the unit already open. The speed trimmers could be precize spindle trimmers so it's easy to get the right speed at 33/44.
"WISE GUY MOD OFF"
Kind regards
Christian
"WISE GUY MOD ON":
When you used shrinking tube at the reservoir caps, why did you not put it over the soldering?
It's a 4700 uF, keeps a lot of power inside when you touch chassis ZAPP!, don't ask me why I know ;-))
I'm missing the clamp for the cap, maybe with some feltpad underneath to get it tight fit.
I would have mounted new pots on the mainboard while I have the unit already open. The speed trimmers could be precize spindle trimmers so it's easy to get the right speed at 33/44.
"WISE GUY MOD OFF"
Kind regards
Christian
Gravity....
Martin (the oracle of all BG4000 knowledge) would frown on replacing the tantalum capacitors with electrolytics, he did explain the reason for this in a previous post of mine when I performed a similar restoration on a BG5000, I do know there are advocates of the replacement with electrolytics (Rudi) however I went with Martins advice and put new tantalums in. You should replace the old electrolytic capacitors with new as they will have dried out and as Christian says change out the skeleton trimmers for new piher sealed trimmers, do this one at a time measuring the settings of the existing one (as best you can) and run the deck, adjusting the trimmer if required, to ensure all is well before moving on to the next one....that way you will know just where to look if things stop working (poor solder joint etc)......so far so good ;¬)
Craig
Martin (the oracle of all BG4000 knowledge) would frown on replacing the tantalum capacitors with electrolytics, he did explain the reason for this in a previous post of mine when I performed a similar restoration on a BG5000, I do know there are advocates of the replacement with electrolytics (Rudi) however I went with Martins advice and put new tantalums in. You should replace the old electrolytic capacitors with new as they will have dried out and as Christian says change out the skeleton trimmers for new piher sealed trimmers, do this one at a time measuring the settings of the existing one (as best you can) and run the deck, adjusting the trimmer if required, to ensure all is well before moving on to the next one....that way you will know just where to look if things stop working (poor solder joint etc)......so far so good ;¬)
Craig
Hi Spassmaker - it's not shown in the photos, but the terminals of the reservoir capacitors have been masked with 'black-tack' which will keep them well insulated. Thanks for your concern. They are also held in place by 'black-tack'.
and to hcraig244, while working on field survey equipment in Houston, if a PCB came in with ANY fault, we always changed out any tantalum capacitors for electrolytics as a matter of course before sending it back out. Even though opinion is divided, I decided to go with that rationale. And as regards the trimmers, on that point I personally like to go with the adage of "if it ain't broke - don't fix it" as they are working fine.
Gravity G.
and to hcraig244, while working on field survey equipment in Houston, if a PCB came in with ANY fault, we always changed out any tantalum capacitors for electrolytics as a matter of course before sending it back out. Even though opinion is divided, I decided to go with that rationale. And as regards the trimmers, on that point I personally like to go with the adage of "if it ain't broke - don't fix it" as they are working fine.
Gravity G.
Location: Cornwall, UK
Obtained HND in Electronics Engineering in 1982.
Retired in 2016, and am still 'tinkering'. Have had my Beogram 4000 and BeoMaster 1900-2 since 1984.
Retired in 2016, and am still 'tinkering'. Have had my Beogram 4000 and BeoMaster 1900-2 since 1984.
Best if you dont apply that adage to the cam belt on your car ;¬)
Craig
Craig
I'll give you that one Craig ! :D
Location: Cornwall, UK
Obtained HND in Electronics Engineering in 1982.
Retired in 2016, and am still 'tinkering'. Have had my Beogram 4000 and BeoMaster 1900-2 since 1984.
Retired in 2016, and am still 'tinkering'. Have had my Beogram 4000 and BeoMaster 1900-2 since 1984.
Hi Mark - been involved with other projects for a while (Major restoration of a 65ft turntable !) I've finally finished re-capping my 1900-2 amp, which is now working.
However, when playing an LP on my BG-6000 it is 'skipping ahead'. I've looked through the manual (obtained from BeoWorld), but can't seem to find how to adjust the shutter..??
(I can't find it in the BG-4000 manual either..)
Can you advise, and say on which page I will find it ?
G.G.
p.s. - photo of BIG turntable attached..
However, when playing an LP on my BG-6000 it is 'skipping ahead'. I've looked through the manual (obtained from BeoWorld), but can't seem to find how to adjust the shutter..??
(I can't find it in the BG-4000 manual either..)
Can you advise, and say on which page I will find it ?
G.G.
p.s. - photo of BIG turntable attached..
Location: Cornwall, UK
Obtained HND in Electronics Engineering in 1982.
Retired in 2016, and am still 'tinkering'. Have had my Beogram 4000 and BeoMaster 1900-2 since 1984.
Retired in 2016, and am still 'tinkering'. Have had my Beogram 4000 and BeoMaster 1900-2 since 1984.
this is the adjustment for a BG4000........
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