Search found 890 matches

by izzy wizzy
Tue Dec 10, 2019 9:05 pm
Forum: Beginners
Topic: pentode screens
Replies: 18
Views: 336

Re: pentode screens

I was looking at some application notes from Murata https://www.murata.com/~/media/webrenewal/products/emc/emifil/knowhow/26to30.ashx to get a handle on this stuff. I thought the CM choke helped, about 8mH @ 4A rated from memory for GM70. Was going to try 3 terminal capacitor as well and then found ...
by izzy wizzy
Tue Dec 10, 2019 8:23 am
Forum: Beginners
Topic: pentode screens
Replies: 18
Views: 336

Re: pentode screens

No - by all means try - but don't commit to any system changes that depend on it. I briefly tried SMPS direct into GK-71 part-way through the Lehane development work. It was clear it would be a short-term set-up. I've gone a similar route. SMPS direct ain't so great even with some filtering. I didn...
by izzy wizzy
Wed Dec 04, 2019 12:49 pm
Forum: Everyones Projects
Topic: 6v smps
Replies: 18
Views: 514

Re: 6v smps

The Meanwell SMPS I have overload on startup but recover and then startup slowly when driving the fils direct. I've had other SMPS fail to start after overload. I immediately thought of thermistors here....not sure whether it's relevent at 4 amps though. A couple of CL60s in the circuit might be sa...
by izzy wizzy
Tue Dec 03, 2019 10:12 pm
Forum: Everyones Projects
Topic: 6v smps
Replies: 18
Views: 514

Re: 6v smps

The Meanwell SMPS I have overload on startup but recover and then startup slowly when driving the fils direct. I've had other SMPS fail to start after overload.
by izzy wizzy
Sun Dec 01, 2019 7:41 pm
Forum: Everyones Projects
Topic: GM70 PP
Replies: 131
Views: 7554

Re: GM70 PP

After living with the Lehane regs on the GM70 fils, I got to thinking I was not liking things as much, even turning off a few times as the sound was quite sterile and not for me so got it out to have a look. Noted the common connection was the negative end while the 4P1L was the positive fil connect...
by izzy wizzy
Sat Nov 30, 2019 5:31 pm
Forum: Everyones Projects
Topic: 6v smps
Replies: 18
Views: 514

Re: 6v smps

I've used 2x5v SMPS in series to get 10v. Could you use 2x3.3v in series to get close to 6v?
by izzy wizzy
Sat Nov 30, 2019 11:22 am
Forum: Everyones Projects
Topic: 6v smps
Replies: 18
Views: 514

Re: 6v smps

I was using a 24V Meanwell SMPS on the GM70 for a bit. I used dropper resistors in each leg to a CM choke and then the filament. They have adjustable output over quite a range for some of the models. Worked fairly well.

I found Meanwell Direct to have the best prices
by izzy wizzy
Thu Nov 28, 2019 8:04 am
Forum: Speakers
Topic: Beyma CP21F match for Beyma TPL150H
Replies: 54
Views: 1263

Re: Beyma CP21F match for Beyma TPL150H

There's also something to said for simple crossovers. Sure you can eq things to make them "flat" whatever that is but you can end up with throwing other enjoyable things away in the process.
by izzy wizzy
Tue Nov 26, 2019 6:14 pm
Forum: Speakers
Topic: Something Stirs in the Workshop
Replies: 61
Views: 11278

Re: Something Stirs in the Workshop

Would it be possible to see some pictures as you go making these things?
by izzy wizzy
Tue Nov 19, 2019 8:42 am
Forum: Speakers
Topic: Something Stirs in the Workshop
Replies: 61
Views: 11278

Re: Something Stirs in the Workshop

You know when form follows function and a thing of beauty is created. That's it there. Wow!
by izzy wizzy
Mon Nov 18, 2019 9:27 pm
Forum: Computer Audio
Topic: picoreplayer
Replies: 21
Views: 1305

Re: picoreplayer

What or where can I get the BBC plugin now? My old one stopped working a while ago and can't seem to find one.

Cheers,
Stephen
by izzy wizzy
Fri Nov 15, 2019 9:49 am
Forum: Everyones Projects
Topic: Remember These?
Replies: 796
Views: 60154

Re: Remember These?

pre65 wrote:
Thu Nov 14, 2019 10:25 pm
Or even papier mache ?
Bits of old newspaper with flour and water.
Pressed into tupperware or similar as a mould, could be very smooth.
by izzy wizzy
Thu Nov 14, 2019 1:10 pm
Forum: Everyones Projects
Topic: GM70 PP
Replies: 131
Views: 7554

Re: GM70 PP

RhythMick wrote:
Thu Nov 14, 2019 12:12 pm
I went with thermistors in the mains primary, bypassed by relay after a few tenths of a second.
That's what I meant. One of them, not varistor/MOV as I said earlier.
by izzy wizzy
Thu Nov 14, 2019 12:11 pm
Forum: Everyones Projects
Topic: GM70 PP
Replies: 131
Views: 7554

Re: GM70 PP

pre65 wrote:
Thu Nov 14, 2019 10:04 am
One reason why I like 6D22s damper diodes. :)
A very good option and if I wasn't addicted to mercury, would be the way to go. I even have them in the shed.
by izzy wizzy
Thu Nov 14, 2019 11:51 am
Forum: Everyones Projects
Topic: GM70 PP
Replies: 131
Views: 7554

Re: GM70 PP

I use slow start to protect the input fuse, better to have components that are happy with worst case situations. From memory, it's a while ago now, I used a varistor/MOV doodad to give things an easier start and then relay bypass it with the start sequencer. What slow start gizmo are you using Nick?