Search found 11693 matches

by Nick
Sat Jun 15, 2019 4:06 pm
Forum: Everyones Projects
Topic: The Other 13E1 SE-OTL
Replies: 117
Views: 5787

Re: The Other 13E1 SE-OTL

There are voltage regulator devices that seem to have the right voltage and current numbers on paper but I'm thinking about heat dissipation/reliability; am I right in thinking that keeping the difference between Vin and Vout is the critical thing regarding heat rather than the how high Vout is, co...
by Nick
Fri Jun 14, 2019 12:09 pm
Forum: Everyones Projects
Topic: Snail Phono Pre
Replies: 194
Views: 40957

Re: Snail Phono Pre

The advantage of the square wave is that you have all the frequencies of interest from the fundamental up in the one test, and to get a square wave out you need all the frequency and phase response to be correct. Its harder than you might think to measure a 1v RMS signal at 1kHz and 2kHz and know if...
by Nick
Thu Jun 13, 2019 1:45 pm
Forum: Everyones Projects
Topic: The Other 13E1 SE-OTL
Replies: 117
Views: 5787

Re: The Other 13E1 SE-OTL

Though any EMC conformant supply should already have taken steps to limit the RF pushed back into the supply. However the clue as to if the supply is properly conformant is normally given by its price and who sold it.
by Nick
Tue Jun 11, 2019 9:48 pm
Forum: Everyones Projects
Topic: GK-71 - economical build.
Replies: 497
Views: 51363

Re: GK-71 - economical build.

what sort of value of limiting resistor would you suggest, please Nick
100R seems about ok to me.
by Nick
Tue Jun 11, 2019 12:12 pm
Forum: Everyones Projects
Topic: GK-71 - economical build.
Replies: 497
Views: 51363

Re: GK-71 - economical build.

Most big pentodes have that sort of limitation. For example EL34, Va=800, Vg2=500.

Not sure there is a official answer other than it seems to work ignoring the value if triode connected and a limiting screen resistor is used.
by Nick
Mon Jun 10, 2019 5:58 pm
Forum: Assorted Stuff
Topic: Room Treatment (Split from Owston thread)
Replies: 26
Views: 394

Re: Room Treatment (Split from Owston thread)

Yep, I know "drive the room" is not that precise. I suspect the problem is the layout of the speakers in the room are what you would do in a small room with the speakers close to the far wall, and relatively close together, whereas (by comparison) some of the better sounding rooms at Munich has spea...
by Nick
Mon Jun 10, 2019 10:08 am
Forum: Assorted Stuff
Topic: Room Treatment (Split from Owston thread)
Replies: 26
Views: 394

Re: Owston 2019 - Listening Impressions

Maybe. I am tempted to create and move this to a room treatment thread.

Chris may have a view, and I can ask GIK, but I can't see coving being that visible to the wavelengths in question. Of course without measurement, we don't really know what problem we are trying to solve.
by Nick
Mon Jun 10, 2019 8:37 am
Forum: Assorted Stuff
Topic: Room Treatment (Split from Owston thread)
Replies: 26
Views: 394

Re: Owston 2019 - Listening Impressions

Yep, Thats my point, I am sure there is stuff that can be done to improve matters.
by Nick
Mon Jun 10, 2019 1:05 am
Forum: Assorted Stuff
Topic: Room Treatment (Split from Owston thread)
Replies: 26
Views: 394

Re: Owston 2019 - Listening Impressions

Ao what do you suggest Chris? We should throw our hands up and accept a poor sound, or try and improve things?
by Nick
Sun Jun 09, 2019 8:57 pm
Forum: Everyones Projects
Topic: The Nemesis 813 PP Amplifier
Replies: 319
Views: 12482

Re: The Nemesis 813 PP Amplifier

Test with graphite gm70's then get a set of copper for best.
by Nick
Sun Jun 09, 2019 3:47 pm
Forum: Assorted Stuff
Topic: Room Treatment (Split from Owston thread)
Replies: 26
Views: 394

Re: Owston 2019 - Listening Impressions

No bigger than most of the rooms at Munich and they had some good sounds.
by Nick
Sat Jun 08, 2019 12:04 pm
Forum: Assorted Stuff
Topic: Room Treatment (Split from Owston thread)
Replies: 26
Views: 394

Re: Owston 2019 - Listening Impressions

The room has a bunch of GIK panels and corner traps, but its still hard to get speakers to actually drive the room (if that makes any sense).
by Nick
Sat Jun 08, 2019 10:09 am
Forum: Assorted Stuff
Topic: Room Treatment (Split from Owston thread)
Replies: 26
Views: 394

Room Treatment (Split from Owston thread)

I t might be useful to measure that room as I don't think we have ever made speakers sound as good as they should in it.
by Nick
Fri Jun 07, 2019 9:32 pm
Forum: Everyones Projects
Topic: And another one
Replies: 21
Views: 874

Re: And another one

Glad you like it Greg. Phono stages are fun things to design.
by Nick
Thu Jun 06, 2019 5:14 pm
Forum: Everyones Projects
Topic: 833A (GU-48) Amp
Replies: 1144
Views: 122705

Re: 833A (GU-48) Amp

I think you have problems paralleling the two up. This might be a better choice

https://www.ebay.co.uk/itm/800W-30A-DC- ... 2714482436