audio-talk

Only just come to this reply from Wolfgang, because today, I’ve been having a play with choke-loading the driver stage, in order to clean up the driver swing. I couldn’t fit the chokes inside the box, so they’ve had to go on the outside, between the two 6H30pi. This valve cries out to be choke loade...

Sounds good to me. Thanks Ray.

Do you consider the psu caps in series with the output cap regarding the audio signal? In this case a cap multiplier with very little capacity caps like I use with the InvOTL or a HV reg psu like the Maida reg. for the output stage (keeping the TL738 as CCS) would improve the SQ. How did you calcul...

...bypass your output cap with summat decent. My Nichicon KG caps are bypassed with Mundorf ZXs, which are themselves bypassed with polystyrenes... Yep, I’ve had pretty mixed results with bypassing caps, so became a bit jaded and sceptical over the years. However the silver mica caps have worked wo...

Can still get Mica, but getting darned expensive now. I was looking at getting some a year ago. Just had another look, yeh 10nF 500V 1% on the RS site, £24.70 each. £12.50 each if you buy 50. :shock: Jeez! Just thinking about the whole OTL thing. Mine, and all the rest of the single ended OTLs out ...

I'd forgotten about those. I got them back in the day when Russian stuff, caps and some valves, were cheaper than chips. I don't remember how much they were, probably less than a quid each. Well I’ve found good use for them at last! Not bad for £1, even if I didn’t pay for them (at least I don’t th...

Found some big old Russian 0.01uF, silver mica caps and yesterday, on a whim, tried them as bypasses across the output caps. Niiice. :) I think I got these from Simon, way back in the dim and distant past and never found a use for them. I vaguely remember trying them as bypasses on the interstage co...

Now those are ultra-shoddy!

Not yet, but I think I have identified the culprit. The question is - what is the solution? Shorting pins 2 and 3 of the XLR input, i.e. the primary side of the line input transformer, stopped the oscillation dead in its tracks. This was consistent and repeatable. As I said previously, there is a l...

We live high up, so no problems here, but I had a dog out this morning and looking out over the Don valley, it’s biblical.

Not doubting you know your own ears but I've read we can get pleasure from high frequencies through our eyes which may explain the preoccupation with super tweeters. This audio game is not only just about ears but a whole body experience. I’ve read that too, so if you wear glasses, you must be miss...

pre65 wrote: ↑

Fri Nov 08, 2019 6:44 am

Steve, does Ants 15" version of the driver "suffer" the same issues that you had with the 12" verson ?

Yes, but not to the same degree. IMO it’d still need correcting.

I’m not complaining. It makes phone calls and sends texts That’s all I want from a phone.
I have my iPad and Mac for the rest of the stuff.

I would check the value of the feedback resistor on the faulty monoblock. Comparing it with the feedback resistor on the working amp, so that both are actually *visually* compared. That way, if one is different to the other, it’ll stand out. With an OTL like this one it’d be impossible to get the fe...

Some apps? Luxury!...My iPhone 4 isn’t compatible with anything now!