Posts by Martin Hemmi
30 total posts23 results
Datasheets, name and manufacturer of internal wiring of BEOLAB 8000
in BeoLab · Feb 5, 2025 12:41Dear fellow enthusiasts, during restauration of a few of beolab 8000s i find it necessary to have adapters for calibration of the amps. I already spent a few hours in finding the connectors shown in the picture but i was…
Slight humming noise from Beolab 8000
in Imported Content (Unmapped) · Oct 26, 2021 08:20Yes, all my 4 pairs of restored BL8000 do that, especially when using the rca jacks. But that doesn´t mean it is o.k. The reason is bad circuit design of these cheaply produced electronics. If you disconnect the internal…
Internal audio connector in BEOLAB 8000
in Imported Content (Unmapped) · Sept 10, 2021 13:44Dear fellow enthusiasts, did anyone of you find out, where to get these connectors that B&O used regularly in the 90s? Especially P4 from the BEOLAB 8000. Pin-to-pin distance is 1.83mm approx. Greetings, Martin
Beolab 8000 signal sense circuitry fail
in General Discussion & Questions · Sept 10, 2021 13:08I had the same problem. I found out that TR11 was broken. It is the low side switch for the relay that turns on power. To be safe I changed TR9 , too. Maybe a protection diode could have helped. The circuitry that either…
Slight humming noise from Beolab 8000
in Imported Content (Unmapped) · Sept 10, 2021 12:59Dear fellow enthusiasts, I now recapped and restored 4 pairs of Beolab 8000 with good success. They all had the same issues in more or less evolved states. Besides the crappy PCB-quality a common problem is silent hummin…
Opto-coupler in BEOLAB 8000
in Imported Content (Unmapped) · Jan 4, 2021 14:10Hello, thank you, Dillen, for your kind response. Nice to hear from you. To answer, no, I didn't, at the moment, I don't need one (to be precise 2). My Asperger syndrome leaves me restless untill I know EVERY part of the…
Opto-coupler in BEOLAB 8000
in Imported Content (Unmapped) · Jan 4, 2021 11:46Hello refurbishing world in the BEO-universe, i refurbished some pairs of BEOLAB 8000 now. The design of them increases WAF (wife acceptance factor) of my hobby and one unsolved riddle is the nature of the opto-coupler n…
Beolab 8000 panne
in Français · Jan 4, 2021 11:37Bonjour, i would love to help you but unfortunately my french lessons in school were too long ago. Maybe try a translation to english or perhaps german. A bientot!
Getting a warmer sound from my Beolab 8002 speakers
in General Discussion & Questions · Dec 16, 2020 18:08Getting a warmer sound from my Beolab 8002 speakers
in General Discussion & Questions · Dec 16, 2020 17:58O.k. you have approx. 50 Euros in material and 3-4 afternoons of work. Economically speaking this makes no sense. But if you have an art director wife, things look different. You are welcome, of course.
Getting a warmer sound from my Beolab 8002 speakers
in General Discussion & Questions · Dec 16, 2020 13:49Where do you live?
Getting a warmer sound from my Beolab 8002 speakers
in General Discussion & Questions · Dec 16, 2020 12:03Hi, I restored 3 pairs of Beloab 800(2)s now. Let's be honest. B&O is about design, not high-end equipment. PCBs have bad quality, conductors come of PCBs only when you intensively look at them. PCB-Layout is so bad, you…
Unknown crossover network in Beolab 8000 MKII (8000883). Is a service manual with circuit diagrams for the Beolab 8000 MKII available?
in Imported Content (Unmapped) · Dec 15, 2020 08:59Found it. It is 2.2uF, 50V
Output voltage of amplifier to Tweeter and Bass Speaker in BEOLAB 8000 MK2
in Imported Content (Unmapped) · Dec 14, 2020 09:37Dear fellow audio enthusiasts, output voltages for tweeter (10kHz) and woofer (1kHz) for older versions of BEOLAB 8000 are 2,95 and 4.8V at 0,100 V input according to the service manual. The 4.8V are obiously wrong for n…
Capacitor that determines switch-off-time in BEOLAB 8000 (Phono-input-operation)
in General Discussion & Questions · Dec 14, 2020 09:29Remark: By looking at the R141 (10M) which was o.k. I nearby found a small splash of soldering tin under the stereo microscope.... The problem was again sitting in front of the pcb... Removing the splash of soldering tin…
Capacitor that determines switch-off-time in BEOLAB 8000 (Phono-input-operation)
in General Discussion & Questions · Dec 10, 2020 14:06Good thought on that 10M resistor!
Capacitor that determines switch-off-time in BEOLAB 8000 (Phono-input-operation)
in General Discussion & Questions · Dec 9, 2020 06:33Dear fellow enthusiasts, one of my restored BEOLAB 8000 has a slight issue. It switches a bit too fast (5 seconds) from green to red after switching off music. After studying of the circuit diagram I was wondering if C6,…
Unknown crossover network in Beolab 8000 MKII (8000883). Is a service manual with circuit diagrams for the Beolab 8000 MKII available?
in Imported Content (Unmapped) · Dec 8, 2020 09:40Hi, could you please check value of Capacitor C140?
Circuit diagram change to BEOLAB 8000 MK2 (C140 and C139)
in Imported Content (Unmapped) · Dec 8, 2020 09:39Dear fellow enthusiasts! Apparently i have a pair of MKII-Beolabs 8000. Main difference seems to be that two capacitors C139 and C140 appear on the pcb. What is value of C140? 2,2uF 50V? Does anyone have a cutout of the …
Beolab 8000 Amp Modul removal & repair [Solved]
in Imported Content (Unmapped) · Dec 8, 2020 09:19Yes, I had the same problem.