Posts by alf
1334 total posts1168 results
Beomaster4000 dying channel
in BeoMaster · Mar 2, 2026 01:45Hi Craig, I had the same suspicion but finding the culprit….. next I will check T54 after I found all power transistors to be fine. it could perhaps also be a weak component in the preamp section ? the search will contin…
Beomaster4000 dying channel
in BeoMaster · Feb 28, 2026 15:57hi everyone, my BM4000 has developed a channel drop out issue. its starts quite normal but after 5 to 15? min the left channel just disappears. i checked the corresponding output transistors but they are fine, checked th…
Beogram 6500 carriage movement issue
in BeoGram · Sept 29, 2025 02:11Thank you Mark for confirming that 👍 I revisited the SM yesterday and had that very suspicion I may had done it the wrong way. this and a worn servo belt proved to be the issues. There is still the odd scraping which se…
Beogram 6500 carriage movement issue
in BeoGram · Sept 27, 2025 11:42Hi All, the carriage movement of my BG6500 is impaired: it will travel ok up to almost reaching the run-out groove of a record - I understand that can vary - but it won’t get to its end without hitting a resistance ? I c…
Beogram 4002 Restoration
in BeoGram · Aug 3, 2025 10:35Hi Christian, are you still making these plinths for a Beogram 4000 ? if so, can you send a PM i am in Perth, WA thank you ALF
BeoGram4000 solenoid thumping noise
in BeoGram · Jul 17, 2025 04:54Hi i just finished the restoration of my BG4000 but one annoying issue remains: a thumping noise from the solenoid when activated ? the coil resistance shows 8.7ohm, which is ok the emitter voltage at OTR4 shows 2.7V the…
BeoGram 6500 erratic behaviour
in BeoGram · Jul 13, 2025 07:13Hi, i have decided to offer the Beogram for parts as I am unable to fix it. obviously no one else has a clue either of what could be the problem which is surprising to say the least. there is no faulty component I could …
BeoGram 6500 erratic behaviour
in BeoGram · Jul 11, 2025 04:16Hi All, surprisingly no replies yet ? This issue is as interesting as it is annoying. in the meantime I scratched my head over that activity diagram in the SM which I am sorry to say is not quite clear to me ?? it looks …
Beomaster 8000 output amplifier boards
in Wanted · Jul 11, 2025 03:52Hi, I have the two original amp boards with the heatsinks still attached Both are untested though ! shoot me a PM if interested ALF
Beogram 4000 (is this worth buying as a project?)
in BeoGram · Jul 6, 2025 07:28Hi, I wonder if you did buy it in the end ? I would certainly buy it but have to agree it has the potential to get expensive ?! its a genius but fragile & sensitive design and everyone who buys one should be in the posit…
BeoGram 6500 erratic behaviour
in BeoGram · Jul 5, 2025 06:17Hi All, I am reaching out again with hope one of YOU may have answers ?? the BG6500 plays but here is what happens: randomly the PU arm is dropping about midway on its return once the record has been finished - why ?? al…
Beomaster 8000 start-up & memory issues
in BeoMaster · May 21, 2025 06:56Wow, no one’s git a “light” ? I was under the impression those issues are not that rare or are they ? 9IC6 could of course be a chinese counterfeit chip and with the supply voltage present it would sound more likely unle…
Beomaster 8000 start-up & memory issues
in BeoMaster · May 19, 2025 02:43Hi All, my BM 8000 has a couple of issues: first the start-up: when turning on the unit I have to hold down any source key (fm, tp1/2, ph) until the unit fires up. we are talking about a US model which I operate with a s…
Beogram 6500 RIAA Module damage
in BeoGram · May 12, 2025 05:09Hi Mark, just a quick and interesting update: Assuming the op amps had been damaged I replaced both with LT1364 typ op-amps and was fortunate to manage the smd soldering. but here’s the interesting bit - on board 11 whic…
Beogram 6500 RIAA Module damage
in BeoGram · May 6, 2025 09:37Oh, I see those inverted inputs are also called feedback loop. Well, I hear you and know those op amps are not that expensive which isn’t the problem but as they are smd versions the soldering is the far bigger challenge…
Beogram 6500 RIAA Module damage
in BeoGram · May 6, 2025 01:52One thing I should mention - after the “accident” I by-passed the RIAA board to check whether the problem could be at the muting board? I had a perfect audio signal going through an external phono amp. ALf
Beogram 6500 RIAA Module damage
in BeoGram · May 5, 2025 10:59Thanks for your reply Mark, yes, all 3 ICs are getting the 12V and I have the 22V supply. I checked the in and outputs on IC2 and I C3 and noticed that periodic pulse I hear on the inputs 2 and 6 at IC3 when mute is off.…
Beogram 6500 RIAA Module damage
in BeoGram · May 5, 2025 02:11Hi All, i was hoping some of you can help: while upgrading the RIAA module I accidentally overlooked the mains plug was still plugged in . in the the process the module solder-side touched the chassis the the fuse blew s…
Beogram 6500 performing erratic
in BeoGram · Mar 2, 2025 09:26First of all a big Thank You for your support - very much appreciated 👍 second, I did not check any cartridge coils as I was dead sure the MMC2 and MMC4 were working perfectly before…..and still are. Now everything is b…
Beogram 6500 performing erratic
in BeoGram · Mar 2, 2025 02:17What I meant was i have never seen a BG6500 w/o the RIAA board, perhaps there are early versions w/o that board ? i revisited the SM 2-2 , studied the drawing of the new version RIAA board and measured between the RM and…