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The only reason I can think of which would cause the top to be flattened would be clipping (ie not enough headroom to swing the full signal amplitude). Does this still happen for lower output voltages? Kind regards, Ian.

Black box magic...  Who knows what really happens amongst all those relays and resistors?  :o Without seeing the schematic (and also not knowing much about valves specifically), this is either an artefact of the valves warming up and stabilising, or it's some other part of the circuit reaching...

Check the voltage at these points and let us know what you see: 1.  After the transformer secondary (AC), 2.  After the rectifiers (DC), 3.  If any kind of regulation is done, then check after the regulator circuit Do all 3 tests with the load connected (A), and then with the load...

^^^ We are making progress (even though it may not feel that way to you) - keep your chin up.  We will get to the bottom of this. So, let's see where we are: 1.  PSU is working on both channels with no issues.  We know this because it was tested. 2.  Preamp section is not sending the DC...

Hmmm... that makes it more difficult for me to fault find as my knowledge of valves is very close to 0.  Perhaps 0.1 but not much more than that. What we need to do is isolate where the offset is being generated.  My inclination is that it is most likely being generated by the "pre" stage.  Is...

Thanks very much everyone  :dop: I have a PC speaker build planned for December if I have some free time.  I will share here when I get to building it.  I haven't built anything for quite a while so the itch to make some sawdust is strong!  I may build 2 or 3 different sets simply because I...

Without a schematic it's going to be a bit more tricky to get this sorted out but that circuit looks pretty straightforward so it should be doable without too much hassle. The issue we have here is that we don't know what these resistors do.  They are most likely part of the PSU filtering as...

Good morning all, Thanks to fdlsys for phoning me this morning and letting me know about this thread.  The last time I was on the forum was most likely about 12 months ago or so.  I just don't have much time for the forum anymore these days. Without reading all the posts in this thread, all I...

Why? It's physics - the way the world works  ;) It has to do with the length of the tube.  The longer the tube, the lower the resonance. Google pipe resonance and wavelength calculator and you will find some interesting information there. Kind regards, Ian.

:giggle:  That's not related to the speaker build.  It's 10mm aluminium plate - the top plates for the prototype monoblock amplifiers I am building. I have been making progress with the build, but nothing interesting enough to take pictures of.  I am sealing up the side panels to get them...

Yip, if you want to do it passively then it's definitely not as simple as you think. Also, you will need to apply a high pass filter on the smaller driver otherwise the amp will see both drivers in parallel at low frequencies. Why is it difficult? Because the impedance peak of the bass driver...

Well done for bringing something locally manufactured, well priced and good looking to the market! I wish you all the best with your new venture - :2thumbs: Kind regards, Ian.

I haven't really given it much thought to be honest  :thinking:  I don't currently have a TT either so not something that's drawing my attention on a continual basis.  Perhaps at some point I will give it a go  ;) This question is fascinating to me because answering it can be done very simply...

That's awesome! I think I may just do that  :dop: Excellent question & thanks for posting it. I am working on my answer - will post in a bit  :2thumbs: Kind regards, Ian.

^^^ Thanks guys!  I am having a bit of fun here with this build  :2thumbs: Here we are with the side panels on (dry fit only, no glue).  The center piece of the cabinet is literally just hanging off the 4 dowel rods but it gives an idea: Next I trim down the side...

Finally we get to use some wood glue and clamps  ;D Port detail.  This is just standard 80mm Marley PVC drain pipe I buy from my local hardware store: Top joinery close-up: Once the clamps come off I do my old round-over trick with the ports so they end up looking like this...

It's nothing fancy really - just a manual sanding block which has a vacuum port on it.  It still uses normal arm power to operate  :o You can get them from most decent automotive paint places.  I think the guys in the industry use it for doing body filling work. Kind regards, Ian.

Grit sandpaper?  That's P120. Kind regards. Ian.

The increased voltage capacity is no problem at all. Depending on what and how this is implemented you could also look at things like the input capacitance.  Much higher input capacitance could mean slower switching speeds.  Slower switching speed with Rds 3 times higher than the original could...

Cutting a few strips of the "veneer": Then applying the pieces to the baffle: Then onto my "favorite" pass time - sanding  :vsad: Here you can see what the surface looks like after sanding.  The dark spots are "low" so they show up where the grain hasn't been filled...