pepps wrote:

Am I risking my BM by connecting speakers directly to these two binding posts?

No, that should be fine. But there's no point doing that now that you've concluded that there's no sound. Open up the faulty speaker and have a look at the crossover boards.

Johan wrote:

pepps wrote:

Am I risking my BM by connecting speakers directly to these two binding posts?

No, that should be fine. But there's no point doing that now that you've concluded that there's no sound. Open up the faulty speaker and have a look at the crossover boards.

/  Johan

Just doing a little research to find out how to do just that. I presume the crossover is behind the mid-range drivers...

pepps wrote:

The T40mA fuse blew, which is the display fuse not the amp one, so I'm not sure if there's a fault with the amp itself. Although I'm an utter novice at electronics so I'm trying to learn as I go.

I'm confused as to why one is working and the other not.

It still powers all the control circuitry and preamp stuff. It's just the power section of the amp that's powered through the bigger fuse.

/  Johan

pepps wrote:

Just doing a little research to find out how to do just that. I presume the crossover is behind the mid-range drivers...

No, in the bottom. You need to open it where the binding posts are. Then pull out the boards, noting where the wires connect.

/  Johan

Johan wrote:

pepps wrote:

Just doing a little research to find out how to do just that. I presume the crossover is behind the mid-range drivers...

No, in the bottom. You need to open it where the binding posts are. Then pull out the boards, noting where the wires connect.

/  Johan

I was too impatient 😁

I found out there's nothing behind those midrange drivers but a nice piece of padding.
Damn these things are so beautifully made!

OK I'll go back to the bottom end and open from there.

Thanks Johan 🙂

Update:

I hate to admit this, but when I connected directly to the binding posts hidden away under the Penta amplifier wound the collar onto the plastic sheath of the speaker wire by mistake.

DOH!!!  😳

Having spotted this as I was attempting to get to the crossovers I've corrected my stupid mistake and am now relishing to some Radiohead in STEREO!

Damn these speakers sound so good even without the amplifiers!

I'm going to enjoy them like this for a while before I work out how to get the amplifiers sorted. I mean I suppose they should both have a service before I put them to work.

Thanks Johan and everyone else for the tips.

I'm so happy right now!

😁

Good to hear. Happens to the best of us.

/  Johan

A blown 40 mA fuse and no sound coming bare connected penta's doesn't make sense.

Also no sound at all coming from all the drivers doesn't make sense either. One PCB in the bottom handles low and high range and the other PCB handles the midrange. So if 1 board fails, there should be sound from the other. Unless there has been someone before and did some tinkering.

And also mentioned earlier, a blown 40 mA fuse will only happen if there is a short in one of the components directly behind it. Rectifier at the bottom or at the display, or the LM7815/7915. Less likely is an opamp.

But as you've mentioned as a "novice", the penta isn't the most service friendly as you have to take out the transformer, which sits very precise in place.

Ok, just read your latest experience...

Leaves the task to service the amplifiers.

Beobuddy wrote:

Ok, just read your latest experience...

Leaves the task to service the amplifiers.

Yeah Beobuddy, the amplifiers still need some love - but these columns sound so damn good as they are I'm going to chill out for a few weeks 😁

Seriously, in the past I've had 1702s, 2702s, 3702, Beovox RL3500, Beovox 3000 (flat panel) and even (Celestion) Ditton 44s but these Pentas wired straight with no power amps are just superb! The music is literally floating and dancing in front of me - such an incredible soundstage!

Ok, ok I'm a little smitten. Better stop yabbering 🙂