Search found 482 matches

by RhythMick
Sat May 04, 2019 8:13 am
Forum: Everyones Projects
Topic: Tweeter Amp for OB or Horns
Replies: 154
Views: 10033

Re: Tweeter Amp for OB or Horns

The spirit of Benny Hill is alive and well...
by RhythMick
Fri May 03, 2019 8:29 pm
Forum: Valves
Topic: OH YES
Replies: 14
Views: 551

Re: OH YES

I have a box full of those Audio Note chokes. Really must get around to selling. I think the phrase you're looking for is... "I have a box full of those Audio Note chokes. Really must get around to giving them all away at Owston to DTB" , I know it was on the tip of your tongue, just tryng to help ...
by RhythMick
Thu May 02, 2019 6:50 am
Forum: Valves
Topic: OH YES
Replies: 14
Views: 551

Re: OH YES

I have a box full of those Audio Note chokes. Really must get around to selling.
by RhythMick
Sat Apr 06, 2019 6:29 pm
Forum: Valves
Topic: Help hunting down an odd fault
Replies: 1
Views: 269

Help hunting down an odd fault

I completed my brothers amp a while ago and have since made a number of improvements on the design. I took his amp back and applied the same improvements, but now have an odd fault that has me flummoxed. The amp works fine by itself. We use powered subs. When I power on the left sub, no problem. Whe...
by RhythMick
Sun Mar 10, 2019 2:01 pm
Forum: Everyones Projects
Topic: Phono Frustration
Replies: 52
Views: 1527

Re: Phono Frustration

:D
by RhythMick
Tue Mar 05, 2019 7:04 pm
Forum: Everyones Projects
Topic: Phono Frustration
Replies: 52
Views: 1527

Re: Phono Frustration

ed wrote:
Tue Mar 05, 2019 7:00 pm
in a bit of a hurry at the mo, just going out of the door, but this is the crib I used to use which I think is fairly comprehensive regarding imprting models and libraries:

http://www.simonbramble.co.uk/lt_spice/ ... _spice.htm

I think chapter 4 is the relevant bit.
I'll have a nosey
by RhythMick
Tue Mar 05, 2019 6:24 pm
Forum: Everyones Projects
Topic: Phono Frustration
Replies: 52
Views: 1527

Re: Phono Frustration

We've got discussions on LTSpice on the 'Stacks' section, but it would be nice for someone to ask the simple questions about the valve models again, because I got stuck :D Yes I saw when I revisited that thread, that you got stuck. I think the instructions were a little all over the place. When I g...
by RhythMick
Tue Mar 05, 2019 6:16 pm
Forum: Everyones Projects
Topic: Phono Frustration
Replies: 52
Views: 1527

Re: Phono Frustration

IslandPink wrote:
Tue Mar 05, 2019 6:08 pm
We've got discussions on LTSpice on the 'Stacks' section, but it would be nice for someone to ask the simple questions about the valve models again, because I got stuck :D
Oh I'm VERY good at asking the simple questions....
by RhythMick
Tue Mar 05, 2019 1:43 pm
Forum: Everyones Projects
Topic: Phono Frustration
Replies: 52
Views: 1527

Re: Phono Frustration

I have LT Spice and can use it for components it has loaded, but I haven't been able to master adding models to it. Maybe it needs a concerted effort and some good tutorials ... There's some good valve models that operate from drop down menus over on the intact audio site. My pooter just bombed so ...
by RhythMick
Tue Mar 05, 2019 10:46 am
Forum: Everyones Projects
Topic: Phono Frustration
Replies: 52
Views: 1527

Re: Phono Frustration

Could you measure the voltage drop across the 180R ?

Also consider putting 10R in each cathode to provide a convenient measurement point.
by RhythMick
Tue Mar 05, 2019 10:38 am
Forum: Everyones Projects
Topic: Phono Frustration
Replies: 52
Views: 1527

Re: Phono Frustration

I have LT Spice and can use it for components it has loaded, but I haven't been able to master adding models to it. Maybe it needs a concerted effort and some good tutorials ...
by RhythMick
Tue Mar 05, 2019 9:25 am
Forum: Everyones Projects
Topic: Phono Frustration
Replies: 52
Views: 1527

Re: Phono Frustration

Steve, just looking at your shared cathode resistor for the 5687 triodes. What B+ voltage are you running them at and what bias and plate current are you expecting ? The datasheet for the 5687 shows a wide range of operating conditions. With 180v on the plate, -7v bias with 25mA (each triode) would ...
by RhythMick
Tue Mar 05, 2019 8:39 am
Forum: Everyones Projects
Topic: Phono Frustration
Replies: 52
Views: 1527

Re: Phono Frustration

I'd be very interested to hear what you think of separate vs shared cathodes
by RhythMick
Tue Mar 05, 2019 8:08 am
Forum: Everyones Projects
Topic: Phono Frustration
Replies: 52
Views: 1527

Re: Phono Frustration

Re the output stage. Have you considered (or tried) separate cathode resistors with bypass caps? I recently changed my transformer coupled 26 PP stage to separate cathodes and found it opened the sound up, much more revealing of "microsounds" in the signal. More tonal expression, more atmosphere esp...
by RhythMick
Tue Mar 05, 2019 7:55 am
Forum: Everyones Projects
Topic: Phono Frustration
Replies: 52
Views: 1527

Re: Phono Frustration

izzy wizzy wrote:
Tue Mar 05, 2019 7:46 am
IslandPink wrote:
Mon Mar 04, 2019 11:40 pm
:D
Sound Practices, man !
Well I got much inspiration from them things. JC's siren song changed my outlook for one. Not the circuit as such but his approach.
That was one of my inspirations too. Might try building it one day.