Search found 3033 matches

by Ray P
Sun Sep 08, 2019 4:03 pm
Forum: Assorted Stuff
Topic: Nothing In Particular
Replies: 10659
Views: 748295

Re: Nothing In Particular

Found this little chap having a turn in the garden this afternoon;

Image

Apparently its an Elephant Hawk Moth caterpillar. Bit of a bruiser for a caterpillar as you can see by the 10p piece I put next to him.
by Ray P
Sun Sep 08, 2019 9:55 am
Forum: Assorted Stuff
Topic: The Audio-Talk Cycling thread.
Replies: 2085
Views: 169518

Re: The Audio-Talk Cycling thread.

I've been keeping the cranks turning this week; 119miles covered and 6,400ft climbed.

It was a bit chilly first thing this morning, gonna have to start wearing extra layers and dig out the fingered gloves soon.
by Ray P
Wed Sep 04, 2019 6:38 am
Forum: Assorted Stuff
Topic: Nothing In Particular
Replies: 10659
Views: 748295

Re: Nothing In Particular

Not cars this time and a pretty crap ad at that, but a slice from a great track...



You have to listen to the whole track to experience the genius that was early Roxy Music;

by Ray P
Tue Sep 03, 2019 10:35 pm
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 116
Views: 7077

Re: Inverted OTL with 6SN7/6AS7

Wolfgang wrote:
Tue Sep 03, 2019 7:15 pm
Not bad. I am satisfied with the result.
That took a brave man!
by Ray P
Sat Aug 31, 2019 7:02 am
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 116
Views: 7077

Re: Inverted OTL with 6SN7/6AS7

That's how I am listening since I have built this amp. And I had one faulty tube so far. The sound it made shocked the hell out of me. :mrgreen: What was the DC offset that resulted from the tube failure you experience? The XRK/Neurochrome solutions would obviously catch any upward drift of DC offs...
by Ray P
Fri Aug 30, 2019 10:28 pm
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 116
Views: 7077

Re: Inverted OTL with 6SN7/6AS7

Of course, there is an alternative, non-technical approach that might be woth considering, that of basic risk management. If one lists different scenarios and assess their probability (of occurring) against their impact (what would happen should they occur) you can reach sound conclusions about miti...
by Ray P
Fri Aug 30, 2019 10:15 pm
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 116
Views: 7077

Re: Inverted OTL with 6SN7/6AS7

The InvOTL needs protection from +/- 40V and -250V. The trigger level for the latter needs to be as low as possible (without being triggered by the DC offset!) in order to give enough time for the SSRs to cut it off before it can reach high enough levels at the output that could do damage to the sp...
by Ray P
Fri Aug 30, 2019 10:04 pm
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 116
Views: 7077

Re: Inverted OTL with 6SN7/6AS7

I don't know what's more important or sounds "better". Originally I wanted to use the Salas BIB (got 2 PCBs) but their max input voltage is 40V and the 30V toroids have 43V after rectification. If you use tailor made transformers it should work. But you will need big heat sinks for this ! The SLBs ...
by Ray P
Fri Aug 30, 2019 9:11 am
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 116
Views: 7077

Re: Inverted OTL with 6SN7/6AS7

I am still struggling a bit with finding the best solution for protecting the speakers from tube discharging or other faults caused by DC. I studied at least 10 different circuits (among them the solutions from Neurochrome and XRK which are really the best compared to the rest) but nothing really s...
by Ray P
Fri Aug 30, 2019 8:30 am
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 116
Views: 7077

Re: Inverted OTL with 6SN7/6AS7

Wolfgang, a question about your output stage power supplies. You currently use the SLB modules; these give you a very clean supply but are not regulators so I assume that you keep them stable, with respect to the output voltage, because you use a mains conditioner so your amp always has the same sup...
by Ray P
Thu Aug 29, 2019 10:22 pm
Forum: Everyones Projects
Topic: Latest DSD Decoder Project
Replies: 42
Views: 4789

Re: Latest DSD Decoder Project

I've been at home today so I left the DSC2 decoder playing music all day into a headphone amp to start the 'burn-in' process. The HPA is nothing very special but an awful lot better than listening to the computer speakers and I did actually listen through my headphones for an hour or two; I like wha...
by Ray P
Thu Aug 29, 2019 9:58 pm
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 116
Views: 7077

Re: Inverted OTL with 6SN7/6AS7

Nick's mention of Mike's E-choke project reminded me that I have a couple of the boards in my spares box - I might just dust them off and use them in my 300B HPA project. It will improve things as it has been shown on the Tentlabs page but it's not the same as the SLB... I didn't think it was Wolfg...
by Ray P
Thu Aug 29, 2019 11:56 am
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 116
Views: 7077

Re: Inverted OTL with 6SN7/6AS7

Nick's mention of Mike's E-choke project reminded me that I have a couple of the boards in my spares box - I might just dust them off and use them in my 300B HPA project. Must try to find the thread for them.
by Ray P
Thu Aug 29, 2019 7:33 am
Forum: Assorted Stuff
Topic: The Audio-Talk Cycling thread.
Replies: 2085
Views: 169518

Re: The Audio-Talk Cycling thread.

:thumbright:
by Ray P
Wed Aug 28, 2019 10:22 pm
Forum: Assorted Stuff
Topic: The Audio-Talk Cycling thread.
Replies: 2085
Views: 169518

Re: The Audio-Talk Cycling thread.

It's either a very small penny-farthing or you're a growing lad Mr. Bass...