Search found 5690 matches

by simon
Mon May 06, 2024 8:54 pm
Forum: Valves
Topic: Valve amplifier service
Replies: 200
Views: 98662

Re: Valve amplifier service

Nick wrote: Mon May 06, 2024 8:35 pm However its also possible increasing the NFB will make the amp less stable.
But as I'd be decreasing the ratio it should be okay then?
by simon
Mon May 06, 2024 8:11 pm
Forum: Valves
Topic: Valve amplifier service
Replies: 200
Views: 98662

Re: Valve amplifier service

Okay, I'm in unknown waters :-). The NFB increases the gain, yes? I like the idea of paralleling R18, thanks!
by simon
Mon May 06, 2024 12:32 pm
Forum: Valves
Topic: Valve amplifier service
Replies: 200
Views: 98662

Re: Valve amplifier service

A reminder of the circuit: . WAD K5881 mk 2 small 2.png . Consulting the bible (thank you Mr Jones) the gain of the SRPP is around 82. So I'm guessing really that a gain more like 30 might be better. Playing with different op points for the existing ECC83 pre valve as a simple common cathode stage, ...
by simon
Mon May 06, 2024 12:07 pm
Forum: Valves
Topic: Valve amplifier service
Replies: 200
Views: 98662

Re: Valve amplifier service

The amp has been pretty well behaved at Dave's for three months now. It's still had its odd moment and Dave's had to use ground breakers at times, which isn't great as he can hear the device. But mostly it's been okay. Phew. Dave wanted to try a volume pot in the amp itself rather than use a pre amp...
by simon
Sat May 04, 2024 8:13 pm
Forum: Everyones Projects
Topic: C3g Aikido Phono
Replies: 327
Views: 101358

Re: C3g Aikido Phono

Slow progress but the Boozehound Labs stage is complete. It works, as in put the needle on the record and music comes out of the speakers. I didn't have chance to listen earlier, only check that it actually works. Sounded okay as far as I could tell and I think has more gain than the step ups. . 202...
by simon
Fri May 03, 2024 9:28 am
Forum: Speakers
Topic: TG "The Loudspeaker" Build (Sort of)
Replies: 168
Views: 16589

Re: TG "The Loudspeaker" Build (Sort of)

That's frustrating about the panel sizes, what do you put it down to? At first I wondered if it might be thickness of glue, but it wouldn't account for 1.8mm. I find I tend to oversize some panels by a couple of mm when I'm cutting out so I can trim rout flush at the end. A reflection of my woodwork...
by simon
Wed May 01, 2024 1:14 pm
Forum: New Users
Topic: Hi from Germany!
Replies: 23
Views: 1660

Re: Hi from Germany!

I have nothing to add to this thread, apart from hello!, but it's fascinating. Please keep up the discussion.
by simon
Tue Apr 30, 2024 12:34 pm
Forum: Speakers
Topic: TG "The Loudspeaker" Build (Sort of)
Replies: 168
Views: 16589

Re: TG "The Loudspeaker" Build (Sort of)

Yes I know what you mean. I've used four coats of water based varnish, lightly rubbed down with brown paper between coats, on small bits of oak, then a wax polish. And it does somehow look a bit unnatural. I wonder if it needs a light stain first to enhance the richness of oak?
by simon
Sat Apr 27, 2024 9:46 pm
Forum: Everyones Projects
Topic: More NVA Board Based Stuff
Replies: 17
Views: 1401

Re: More NVA Board Based Stuff

I can also offer freebies! I use a DCB1 buffer with a PCB I drafted and I have spare boards. It needs LSK170s but Nick kindly sent me a few to match for a project and I'm sure he wouldn't mind me passing on the 4 needed. It's got a mute delay but needs a bipolar PS. I've probably got some SuperReg b...
by simon
Fri Apr 26, 2024 9:52 pm
Forum: Assorted Stuff
Topic: RCA Phono Plug Recommendations
Replies: 9
Views: 531

Re: RCA Phono Plug Recommendations

My favourite price! Cheers, I'll drop you a text.
by simon
Fri Apr 26, 2024 6:12 pm
Forum: Buying and Selling
Topic: auction tomorrow morning 11 am
Replies: 4
Views: 530

Re: auction tomorrow morning 11 am

Japan's probably the place Paul. I saw a pair of PX25s there 16 years ago for £1k. A few pairs would pay for the airfare, just don't put them in the hold!
by simon
Fri Apr 26, 2024 6:11 pm
Forum: Assorted Stuff
Topic: RCA Phono Plug Recommendations
Replies: 9
Views: 531

Re: RCA Phono Plug Recommendations

I've had a look for the Profi Gold 1733 jobbies but couldn't really find any, only ready made cables. But yeah I'll give em a go. How much do you want for them?
by simon
Fri Apr 26, 2024 1:47 pm
Forum: Assorted Stuff
Topic: RCA Phono Plug Recommendations
Replies: 9
Views: 531

Re: RCA Phono Plug Recommendations

Thanks chaps. I need at least 8 pairs so will probably try a few of each of the Neutrik and Truconnect and see how they compare.
by simon
Thu Apr 25, 2024 10:20 pm
Forum: Assorted Stuff
Topic: RCA Phono Plug Recommendations
Replies: 9
Views: 531

RCA Phono Plug Recommendations

Anyone have any recommendations for sensibly priced decent quality but not audiophool priced phono plugs? I bought some of these: https://cpc.farnell.com/pro-signal/ps11547/phono-plug-metal-red-10-pk/dp/CN22493?CMP=TREML007-003 But whilst they're very cheap they're also really quite nasty. They fall...
by simon
Mon Apr 22, 2024 7:32 pm
Forum: Speakers
Topic: TG "The Loudspeaker" Build (Sort of)
Replies: 168
Views: 16589

Re: TG "The Loudspeaker" Build (Sort of)

Yeah, still not going to happen :-). We did reach a compromise though - we have no visible speakers in the lounge.

Those Lowther horns look much better from a distance... :lol: