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by Cressy Snr
Thu May 23, 2019 7:00 pm
Forum: Everyones Projects
Topic: Remember These?
Replies: 596
Views: 21417

Re: Remember These?

I've frequently had that. And on different amps, ever since I've had a smart phone. I don't worry about it and I don't try to fix it. :D Aye, It’s high time I took a leaf out of your book. Bruce Rozenblit himself says amp design is full of compromises and perfection is impossible because “optimizin...
by Cressy Snr
Thu May 23, 2019 1:00 pm
Forum: Assorted Stuff
Topic: Attendees Owston 1/2 June 19
Replies: 91
Views: 2574

Re: Attendees Owston 1/2 June 19

jack wrote:
Thu May 23, 2019 12:49 pm
Just a word of warning - It's not advisable to have three people called "Nick" in the same room at the same time.
Or three Steve’s :D
by Cressy Snr
Thu May 23, 2019 11:50 am
Forum: Everyones Projects
Topic: Remember These?
Replies: 596
Views: 21417

Re: Remember These?

Trouble is with these, is that it then becomes a balancing act between high value of stopper and value of grid resistor, because if the combination of the two goes one way, the bias gets unstable; the other way and the thing oscillates. That generally is the point of inductive solutions, they don't...
by Cressy Snr
Thu May 23, 2019 9:51 am
Forum: Everyones Projects
Topic: Remember These?
Replies: 596
Views: 21417

Re: Remember These?

It seems to be OK at the moment. Having built the Transcendent 300B and the Mini-Beast OTLs, I know that Bruce uses 10K grid stoppers on each 300B/EL509. On the push pull EL509 output stage of the beast he uses 100K stoppers. Some commentators think grid stoppers are the work of the devil and push t...
by Cressy Snr
Wed May 22, 2019 11:12 pm
Forum: Everyones Projects
Topic: Remember These?
Replies: 596
Views: 21417

Re: Remember These?

Was playing the amp earlier today and my phone was charging near it. “Bit bi dit, bi dit, bi dah dzzzzzzzzzzzzz” went the speakers, seconds later a text arrived on the phone. “Oh, that’s interesting” I mused. Blasted amp was picking up RF. To cut a long story short, I replaced the 1K grid stoppers o...
by Cressy Snr
Wed May 22, 2019 3:29 pm
Forum: Assorted Stuff
Topic: Owston '19 what are you bringing
Replies: 114
Views: 2007

Re: Owston '19 what are you bringing

The Tannoy PA horn thing was at Eggborough. Andrew had got the loud hailers from a railway station that was upgrading its announcement system . Don’t know what the speakers were that were underneath them. The Devon’s were definitely at Owston as I PM’d him a couple of weeks later wanting to buy them...
by Cressy Snr
Wed May 22, 2019 9:30 am
Forum: Assorted Stuff
Topic: Owston '19 what are you bringing
Replies: 114
Views: 2007

Re: Owston '19 what are you bringing

chris661 wrote:
Wed May 22, 2019 8:33 am
Dave the bass wrote:
Tue May 21, 2019 6:23 pm
AndrewI demo'd a system that incorporated small tannoy horns a good time ago IIRC.
Thought it was the 10" Tannoy Golds in ported boxes..?

Chris
They were Tannoy Devon speakers. I connected my 13E1 SE Alexandra Palace amp to them and the sound was fab.
by Cressy Snr
Tue May 21, 2019 11:33 am
Forum: Assorted Stuff
Topic: Owston '19 what are you bringing
Replies: 114
Views: 2007

Re: Owston '19 what are you bringing

The best part of the Owston experience is introducing your system to the sound of, “get on with it for fook’s sake” You then turn towards the CD player, hit “play”on your FFSS, Bert Kaempfert album, then turn round to find the room empty and only the door to the bar swinging gently on its hinges. :m...
by Cressy Snr
Sun May 19, 2019 5:24 pm
Forum: Everyones Projects
Topic: The Nemesis 813 PP Amplifier
Replies: 309
Views: 10707

Re: The Nemesis 813 PP Amplifier

izzy wizzy wrote:
Sun May 19, 2019 3:05 pm
Latest audio circuit
Look like it’ll kick some serious booty! :)
by Cressy Snr
Sat May 18, 2019 3:39 pm
Forum: Speakers
Topic: Something stirs in the Undergrowth
Replies: 2395
Views: 302439

Re: Something stirs in the Undergrowth

Are you bringing the baffles to Owston?
by Cressy Snr
Fri May 17, 2019 6:47 pm
Forum: Your Fave Artists
Topic: What Are You Listening To Right This Minute?
Replies: 3199
Views: 222614

Re: What Are You Listening To Right This Minute?

Clifford T Ward - Mantle Pieces. Lovely.
by Cressy Snr
Wed May 15, 2019 5:40 pm
Forum: Everyones Projects
Topic: Remember These?
Replies: 596
Views: 21417

Re: Remember These?

Cant really do much to the input/driver stage, as it’s all on PCBs, including the 9 pin sockets, so there’s not much chance of breaking anything. :) I’m done messing about now, honest.
by Cressy Snr
Wed May 15, 2019 3:18 pm
Forum: Everyones Projects
Topic: Remember These?
Replies: 596
Views: 21417

Re: Remember These?

Yes, it’s nice when you get to this stage with a project. The measurements I took were initially to make sure I was not running the alternatives to the 6H30pi drivers at levels that could have caused them harm. It was later that I began to link the measurements to the sounds I was getting from each ...
by Cressy Snr
Wed May 15, 2019 1:48 pm
Forum: Everyones Projects
Topic: Remember These?
Replies: 596
Views: 21417

Re: Remember These?

Further on again: Did some measuring of voltages and both the 6H30pi and the 6GG7 produce decent operating points of 2V and 6 or so mA of current, with around 108V on their anodes from a 165V supply. Both look decently linear on the curves for each valve. Both valves sound nice and clean driving the...
by Cressy Snr
Wed May 15, 2019 11:36 am
Forum: Everyones Projects
Topic: Remember These?
Replies: 596
Views: 21417

Re: Remember These?

More news on the 6CG7 as input/driver stage: Low level treble detail is really rather good, so it does the tinkly bits very well. Piano tone is spot-on and vocals are excellent across the board, from Sarah Vaughan to John Lennon. In comparison the the Russian valves, the American 6CG7 is a bit more ...