Recent content by Boli46

The only resistors I have in my series crossovers are the ”swamping resistors” in parallel with the AVC Slagleformers for the mid horns and in parallel with the AVC Crites 3636 for the tweeter horns. This setup shows a stable 16 Ohm impedance looking back into the crossover and a high damping...

I’d recommend that you try them out sooner rather than later. What crossovers are you using? Years ago when my VOTTs were straight A7-500s I briefly used the Altec N501-8A crossovers, but they were very dull and boring. Everything else that I tried was much better. Nowadays my VOTTs are more...

You didn´t read my post very carefully, did you. To begin with my post was not about a low power DHT amp, but a DHT line amp. The 5 uF GTO cap was not the only cap in the two choke input power supply stages, it was in parallel with a 100 uF DC-link cap. There was nothing wrong with the voltages.

Yes, I know. I noticed them in a photo of your crossovers some time ago. It’s you, me and Jeff Medwin. Nobody else uses them, as far as I know. If you have any left, I would strongly recommend you to try them in high voltage power supplies in parallel with DC-links. Choke input of course. This...

These days I only use DC-Link caps bypassed with GTO-caps in high voltage power supplies. I’m grateful to Jeff Medwin/DrLowMu for the info on the GTO caps. I don’t often agree with the good doctor, but here he hit the nail on the head. He bought a few 5 uF Arcotronics GTO caps from a guy in The...

I spy a couple of blue TDK DC-link caps on the left side of the photo. These days I only use DC-links (bypassed with GTO caps) in high voltage supplies. I have bought a number of these TDKs, but have not put them to use yet. It would be very interesting to hear your impression of these caps when...

I’m sorry for you’all. I don’t have any of the problems you’re all whinin' about. I must be blessed by the Lord.

Exactly!

Yamamoto plate caps are by far the best I have used. Expensive but well worth it. The pressure of the cap can be adjusted to slightly different diameters of the top connector. Nothing else like it.

It seems like most of Captain Beefhearts numerous and voluminous posts on this forum can be boiled down to a single sentence: Electrolytic caps are just as good as plastic film caps, because my measurments say so. This puts me in mind of a famous saying by Daniel von Recklingshausen, one of the...

If you had, you’d know that this is not a tractrix horn, it’s a Kugelwellen (spherical wave) horn. Quite different.

You haven’t read this thread from the start, have you?

For a description of the Kugelwellenhorn you might like to Google the Jean-Michel Le Cléac’h presentation Acoustical horns and waveguides from the 2010 ETF. It starts at page 78.

It’s a Kugelwellen (spherical wave) horn, not tractrix.

I looked up the Hurst PA motor fitted to the VPI Classic. This is a permanent magnet AC synchronous type. Three phase if I am not mistaken.