Search found 6794 matches

by IslandPink
Mon Jun 24, 2019 6:48 pm
Forum: Your Fave Artists
Topic: What Are You Listening To Right This Minute?
Replies: 3236
Views: 234112

Re: What Are You Listening To Right This Minute?

Well done, Steve - I found out something there, too !
by IslandPink
Mon Jun 24, 2019 6:44 pm
Forum: Beginners
Topic: Phono Hum
Replies: 10
Views: 118

Re: Phono Hum

Nick : "I would try shorting after the 12k resistor to ground and see if the 60mv hum goes away. That way you are tracking it down to the first stage and transformers" Yes, this did the trick. Hum at output much less , < 5mV. I also checked the ripple on the B+ after the CCS and this was halved. So ...
by IslandPink
Sun Jun 23, 2019 11:10 pm
Forum: Beginners
Topic: Phono Hum
Replies: 10
Views: 118

Re: Phono Hum

Ah, righto. Interesting ...
by IslandPink
Sun Jun 23, 2019 8:25 pm
Forum: Beginners
Topic: Phono Hum
Replies: 10
Views: 118

Re: Phono Hum

Yes, good hunch.
I got about 10x reduction in output hum.
Perhaps it's just a few inches of unshielded ( but twisted ) litz from the connectors to the step-ups, then ?
The wire from Txs to circuit is shielded.
Phono_hum_test.JPG
by IslandPink
Sun Jun 23, 2019 5:09 pm
Forum: Beginners
Topic: Phono Hum
Replies: 10
Views: 118

Re: Phono Hum

I'm just going to go upstairs for some mu-metal to see if there's any chance the input D3a's are just picking up 50Hz from the mains transformer or chokes - although they are at the other end of the unit to the PS. No effect at all. Surprising. One thing I did notice, checking scope earth lead , th...
by IslandPink
Sun Jun 23, 2019 4:46 pm
Forum: Beginners
Topic: Phono Hum
Replies: 10
Views: 118

Re: Phono Hum

This is on the kitchen table, just the phono and scope.
I'm just going to go upstairs for some mu-metal to see if there's any chance the input D3a's are just picking up 50Hz from the mains transformer or chokes - although they are at the other end of the unit to the PS.
by IslandPink
Sun Jun 23, 2019 4:44 pm
Forum: Speakers
Topic: ariels
Replies: 5
Views: 125

Re: ariels

Except the quartet of very good ones that I have, that have been in a North-facing room.
by IslandPink
Sun Jun 23, 2019 4:37 pm
Forum: Beginners
Topic: Phono Hum
Replies: 10
Views: 118

Re: Phono Hum

Good point. I checked and the step-ups each have two M4 studs that come through the top-plate and attach with nuts. So I think there's earthing of the cases there.. except that I can't see that the outer part of my top-plate is actually earthed anywhere :oops: There's a job for some time. However, a...
by IslandPink
Sun Jun 23, 2019 3:06 pm
Forum: Beginners
Topic: Phono Hum
Replies: 10
Views: 118

Phono Hum

I have been putting off dealing with this for a while, too much going on with the speaker work. Finally I started having a look during the week. I suspected it was arm wiring or earthing , but taking the phono wires from the Mayware and checking continuity, all checked-out. So I then took Nick's adv...
by IslandPink
Sat Jun 22, 2019 10:27 pm
Forum: Assorted Stuff
Topic: North West Audio Show - Cranage Hall
Replies: 17
Views: 245

Re: North West Audio Show - Cranage Hall

It's a nice venue - went last year ... was a bit hot, then !
by IslandPink
Sat Jun 22, 2019 10:22 pm
Forum: Assorted Stuff
Topic: The Audio-Talk Cycling thread.
Replies: 2014
Views: 142296

Re: The Audio-Talk Cycling thread.

Dave the bass wrote:
Sat Jun 22, 2019 9:31 pm
... was fueled by a King Tubby dub compilation all the way back home
Respect Due !
( as Stouffer would say )
by IslandPink
Sat Jun 22, 2019 8:30 pm
Forum: Speakers
Topic: ariels
Replies: 5
Views: 125

Re: ariels

Oh dear.
There's a pair here missing the tweeters. Made by my friend Hywel in 2003.
I had started selling the bits :oops:

By all means have a drink though !
by IslandPink
Sat Jun 22, 2019 6:09 pm
Forum: Assorted Stuff
Topic: The Audio-Talk Cycling thread.
Replies: 2014
Views: 142296

Re: The Audio-Talk Cycling thread.

Good effort . I couldn't do that sort of thing after a month's break - not these days. Talking of hands though, left and right - just been down for my second visit to the new Bodfari 'training facility'. I wanted to find somewhere to do some very basic bouldering (climbing) training, away from the g...
by IslandPink
Sat Jun 22, 2019 3:59 pm
Forum: Speakers
Topic: Chinese Loudspeaker Drive Units
Replies: 4
Views: 103

Re: Chinese Loudspeaker Drive Units

I quite like the look of the 10" ones, those ridges in the outer part of the cone are interesting - like the Coral units. Did you hear any looking like that, Nick ?
by IslandPink
Fri Jun 21, 2019 11:46 pm
Forum: Assorted Stuff
Topic: The Audio-Talk Cycling thread.
Replies: 2014
Views: 142296

Re: The Audio-Talk Cycling thread.

Cycling's all about the legs - not the hands !