Search found 824 matches

by izzy wizzy
Sat Sep 21, 2019 9:29 pm
Forum: Speakers
Topic: Something stirs in the Undergrowth
Replies: 2440
Views: 337222

Re: Something stirs in the Undergrowth

I've bought many cheap routers - 3 in all for work; kitchen fitting mainly. Then I bought Makita this year to make a set of Edwardian stairs as I didn't trust the cheap stuff for that. Bloody hell, there's a huge difference not only in power but smoothness and shear cutting ability even with the bud...
by izzy wizzy
Sun Sep 15, 2019 11:33 am
Forum: Everyones Projects
Topic: We are delighted to announce ...
Replies: 5
Views: 143

Re: We are delighted to announce ...

Congratulations. Is this for you or someone else? Be interested to hear what you think in comparison to your PP amp.

Cheers,
Stephen
by izzy wizzy
Sat Sep 14, 2019 10:47 am
Forum: Speakers
Topic: Something stirs in the Undergrowth
Replies: 2440
Views: 337222

Re: Something stirs in the Undergrowth

Ray P wrote:
Sat Sep 14, 2019 6:23 am
IslandPink wrote:
Fri Sep 13, 2019 10:55 pm
Just waiting to offer my card details -
It'll take a bit of a hit - $150!
Worth every cent. I'm in the queue card poised.
by izzy wizzy
Sun Sep 08, 2019 8:58 pm
Forum: Speakers
Topic: Something stirs in the Undergrowth
Replies: 2440
Views: 337222

Re: 15A project

Well worth registering here, if you like speaker build threads with pictures. Lots of sweat and struggle here, building a Western Electric 15a replica : https://www.analog-forum.de/wbboard/index.php?thread/142137-selbstbau-eines-western-electric-we-15-horns/ Great thread. Is that your next move the...
by izzy wizzy
Sun Aug 25, 2019 9:42 am
Forum: General Vinyl
Topic: Mayer Split-EQ
Replies: 8
Views: 351

Re: Mayer Split-EQ

It got me thinking but my brain hurt. Haven't yet embraced lcr eq so this is beyond my understanding as to why it would be a good idea but maybe I missed something.
by izzy wizzy
Sat Aug 24, 2019 5:15 pm
Forum: Everyones Projects
Topic: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
Replies: 1097
Views: 108871

Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Check the value of the 47k resistor feeding the 100u capacitor. If it was low or has been shorted via a solder blob, the cap will charge up stright away rather than following slowly.
by izzy wizzy
Sun Aug 18, 2019 9:28 pm
Forum: Speakers
Topic: Fane 12-250TC Retro Speaker.
Replies: 284
Views: 32348

Re: Fane 12-250TC Retro Speaker.

[quote="Ray P" post_id=167926 time=1566159636 user_id=124... and there was only one pair of speakers in the afternoon that I found fell outside my envelope of acceptability.
[/quote]

Ooohh controversial
by izzy wizzy
Fri Aug 16, 2019 10:25 pm
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 116
Views: 7079

Re: Inverted OTL with 6SN7/6AS7

I was thinking filaments due to voltage limit. An interesting concept maybe.
by izzy wizzy
Fri Aug 16, 2019 9:40 am
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 116
Views: 7079

Re: Inverted OTL with 6SN7/6AS7

A bit fell off the end of my post. Was wondering if anyone had played around with this type of rectification or any other diyaudio modules like this?
by izzy wizzy
Thu Aug 15, 2019 6:56 pm
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 116
Views: 7079

Re: Inverted OTL with 6SN7/6AS7

Looks like one of those synchronous mosfet rectifier doodads followed by a cap multiplier. Seem to remember there was another diyaudio thread with this kind of rectifier. Wasn't jc going on about something like this a while ago?
by izzy wizzy
Tue Aug 13, 2019 7:15 pm
Forum: Everyones Projects
Topic: GM70 PP
Replies: 67
Views: 3299

Re: GM70 PP

Hooking up the SMPS direct to the filaments was never going to be the final solution but it got me started. Put in 8mH common mode chokes between to great effect. Then you can hear the signature of the SMPS on the sound once a fair portion of the ripple has gone. Spec for the PSUs are 120mV of rippl...
by izzy wizzy
Mon Aug 12, 2019 11:10 am
Forum: Everyones Projects
Topic: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
Replies: 1097
Views: 108871

Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

I can get some boards done. I was hoping there might be a few takers to help cover costs, you need to order a decent amount to make it worthwhile. SMPS would work fine on the smaller PCB, but you might get HF artifacts breaking thru. Nevertheless, as long as the heatsink can cope, which it should d...
by izzy wizzy
Sat Aug 10, 2019 6:53 pm
Forum: Everyones Projects
Topic: GM70 PP
Replies: 67
Views: 3299

Re: GM70 PP

IslandPink wrote:
Sat Aug 10, 2019 6:44 pm
Nick wrote:
Sat Aug 10, 2019 6:11 pm
.... If it doesn't agree with experiment, it's wrong. Richard P. Feynman"
Now then Nick - remember what we said over email, about citing Richard Feynman against people in an argument ?
I wasn't game to tackle that one ;)
by izzy wizzy
Sat Aug 10, 2019 6:31 pm
Forum: Everyones Projects
Topic: GM70 PP
Replies: 67
Views: 3299

Re: GM70 PP

Nick wrote:
Sat Aug 10, 2019 6:11 pm
Or, sometimes more complex is better full stop. Without needing the mental gymnastics making black into while so it fits in with a dogmatic position.
That's why I like it round here. So many other forums decend into a pissing contest of what's "right" ... whatever that is.
by izzy wizzy
Sat Aug 10, 2019 4:58 pm
Forum: Everyones Projects
Topic: GM70 PP
Replies: 67
Views: 3299

Re: GM70 PP

Once the grid goes positive, it becomes an anode. Thanks Nick. Obvious really isn't it. So that makes me wonder why I see some circuits have caps in that position (bias point on the IT to ground) and some don't. Maybe I should go and play in the sim and try and answer that. In my head, I've kinda b...