Posts by Beo_Jean (archived2)
349 total posts332 results
Beomaster 2400 failure
in General Discussion & Questions · Jul 26, 2020 17:42Oh my! ERO red capacitor nest here... While you're there, you should change them also...
BeoMaster 4400 Power Fault/DC on Output
in Imported Content (Unmapped) · Jul 22, 2020 03:08Is the unit was serviced before that? I mean full checkup and capacitors replaced? It can be so many things but the relay should kick in before blowing transistors IMO You will need the proper tools to diagnose this prob…
Beocenter 2600 dead on arrival
in Imported Content (Unmapped) · Apr 11, 2020 21:46Did you check the fuses? The input butons should release the off button when pressed regardless if there is power or not. Looks like tar on the input buttons so don't be surprised to find some also into the button mechan…
Re-coning speakers? MS150 10" woofers
in Imported Content (Unmapped) · Mar 24, 2020 20:11You mean refoamed? Reconing means you're changing the entire cone which I doubt. Talking personally, I have a pair of REVOX Plenum B which were refoamed (foam surrounds changed) and the surrounds are way too stiff now as…
Dont say anything....
in Imported Content (Unmapped) · Mar 17, 2020 23:46I'm glad it made the travel safely! You owe me nothing other than keeping me entertained with your future projects! Congrats!
Dont say anything....
in Imported Content (Unmapped) · Feb 3, 2020 22:03Craig, What's the temperature set point of your soldering pen?
Beomaster renovations
in Imported Content (Unmapped) · Feb 2, 2020 15:22Very interesting discussion... actually both of you have good points but keep it civilized... ;-)
Taking on the BM8000
in Imported Content (Unmapped) · Feb 1, 2020 13:52[quote user="Dillen"] Very nice. MKS is probably not the worst choice here, but I really would have chosen tantals for the two in the remote receiver amplifier. B&O chose to use tantals here for a reason. We talked about…
Dont say anything....
in Imported Content (Unmapped) · Jan 23, 2020 00:41[quote user="chartz"]Hi, Other than that, excellent work Craig, but I think replacing transistors just because of a bad HFE is a bit overdoing it 😕 [/quote] Jacques, By no means I want argue with something so subjective…
Dont say anything....
in Imported Content (Unmapped) · Jan 21, 2020 00:13Craig, Just to follow up on your third last post. I tried to simplify the transistor HFE vocabulary but I'm afraid that I might have introduced the wrong words. The transistor HFE is the current amplification coefficient…
Dont say anything....
in Imported Content (Unmapped) · Jan 17, 2020 02:23You may consider taking the 2N3055 from the power supply if they show a better HFE figure and send those to the left channel? Just a thought...
Dont say anything....
in Imported Content (Unmapped) · Jan 17, 2020 02:07Craig, If I were you, I would just change the IC 423 for now. When everything is in order, check the output level difference between both channels and see if this is manageable with the input potentiometers. Now, I can't…
Dont say anything....
in Imported Content (Unmapped) · Jan 16, 2020 01:14The one you spotted is lower than the minimum spec (HFE 30). The modern equivalents are: - 37741 = 2N5320 - 37740 = 2N5322
Dont say anything....
in Imported Content (Unmapped) · Jan 14, 2020 23:52Here's my best suggestion for now. Take the output board schematic, write down the HFE you are measuring for each corresponding transistor and post the picture here. Same as you did previously for the voltages. I will gi…
Dont say anything....
in Imported Content (Unmapped) · Jan 14, 2020 23:44Craig, When looking for replacement transistors, it is important to stay close the the original characteristics like the voltages, forward current, heat dissipation expressed in watts, pinout, better but not less. Regard…
Dont say anything....
in Imported Content (Unmapped) · Jan 14, 2020 23:04Wait before ordering, i'll get back toy you...
BM2000 2801 Amp Trimpot change blows left channel fuses
in Imported Content (Unmapped) · Jan 13, 2020 11:03TIP 142/147 are fine. I would replace all four
BM2000 2801 Amp Trimpot change blows left channel fuses
in Imported Content (Unmapped) · Jan 13, 2020 00:53Hard to tell at first like this but the mica behind that TIP141 looks really crooked. A blowing fuse indicates a short or an overload. Check if you bridged traces accidentally when soldering. Time to check those output t…
Dont say anything....
in Imported Content (Unmapped) · Jan 12, 2020 18:05Craig, I don't recall seeing a thread discussing the subject. As a standard procedure, i'm checking all transistors and checking mostly the HFE and leakage but also, the transistor has to be properly identified the DCA75…