Search found 1496 matches

by izzy wizzy
Fri Jul 28, 2023 8:48 pm
Forum: Solid State
Topic: DIY Transistor Amp Using NVA Boards
Replies: 435
Views: 178409

Re: DIY Transistor Amp Using NVA Boards

If I may take you back to an earlier post of yours .... "With 85dB efficient speakers, a solid-state amp of decent power is the obvious choice." Is the valve amp crappy or is it just not a match for those speakers? I would also wager that the valve amp you have there is hardly as max'd out...
by izzy wizzy
Sun Jul 23, 2023 10:25 am
Forum: Everyones Projects
Topic: Reducing HT
Replies: 2
Views: 2875

Re: Reducing HT

Thanks Nick. That explains it real well and I should be able to use a multiwinding tx I have lying around.
by izzy wizzy
Sun Jul 23, 2023 8:30 am
Forum: Everyones Projects
Topic: Reducing HT
Replies: 2
Views: 2875

Reducing HT

I have a question for the panel. I need to increase the HT to the front end of my power amp so I made it cap input with a 6u8 cap after a FW valve rectifier. It got me going but isn't enough HT. I'm experimenting by DC coupling the first and second stages. I want to go back to choke input (to rule o...
by izzy wizzy
Mon Jun 26, 2023 5:40 am
Forum: Everyones Projects
Topic: GM70 PP
Replies: 204
Views: 121275

Re: GM70 PP

simon wrote: Sun Jun 25, 2023 10:30 am Congratulations Stephen, it sure sounds like a landmark. But what are you going to do with your time now? :lol:
I now have to make them look good or at least acceptable for living room :roll:
SWMBO has been very understanding so far but .....
by izzy wizzy
Sun Jun 25, 2023 7:24 pm
Forum: General Vinyl
Topic: Teres bearing
Replies: 11
Views: 4810

Re: Teres bearing

Looking at the Teres manual…. The thrust pad is Delrin (I know it’s a novel concept to read instructions :D). Looking at their sectional drawing I am unclear where the metal disc goes. https://www.vinylengine.com/library/teres/bearing.shtml I seem to have an early model before the delrin disk embed...
by izzy wizzy
Sun Jun 25, 2023 10:40 am
Forum: Everyones Projects
Topic: GM70 PP
Replies: 204
Views: 121275

Re: GM70 PP

Only using Rod's raw dc circuit to power a modded Lehanne reg.
by izzy wizzy
Sun Jun 25, 2023 6:16 am
Forum: General Vinyl
Topic: Teres bearing
Replies: 11
Views: 4810

Re: Teres bearing

Or possibly Delrin from memory. Maybe Mark can remember.
by izzy wizzy
Sun Jun 25, 2023 2:41 am
Forum: Everyones Projects
Topic: GM70 PP
Replies: 204
Views: 121275

Re: GM70 PP

I've finally done what I set out to do 20 odd years ago. The amplifiers are now quiet enough and so I can finish the case and think about improvements now the technical basics are in place. There were times when I thought of giving up. Going to the shed to try and get previous versions going was a t...
by izzy wizzy
Sat Jun 24, 2023 8:42 pm
Forum: General Vinyl
Topic: Teres bearing
Replies: 11
Views: 4810

Teres bearing

After 20 years or so running, the 401 bearing thread made me think I should look at mine. It was getting a bit noisy with a small scraping noise about every revolution. IMG_20230624_221030138_HDR_compress17.jpg There's quite a bit of wear on the thrust plate. I can't remember the material of the whi...
by izzy wizzy
Sat Jun 10, 2023 9:16 pm
Forum: Garrard Turntables
Topic: 401 bearing issues
Replies: 69
Views: 50055

Re: 401 bearing issues

It probably depends on the details of the bearing and what work has been done on it. Remember the 301's used grease rather than oil. However some of this is probably because of the loose tolerances and the need to damp things. I remember the story about the Teres turntable and how they increased th...
by izzy wizzy
Sat Jun 10, 2023 12:59 am
Forum: Garrard Turntables
Topic: 401 bearing issues
Replies: 69
Views: 50055

Re: 401 bearing issues

Daniel Quinn wrote: Fri Jun 09, 2023 9:54 pm I'm perfectly willing to admit I have no experience .
..
But Im very clever despite losing 30 % of my brain 🤣 and nothing you have said makes me think you have anything valid to say .
OMFG, this ranks up there with one of the most stupid posts I've ever read.
by izzy wizzy
Fri Jun 09, 2023 9:39 pm
Forum: Garrard Turntables
Topic: 401 bearing issues
Replies: 69
Views: 50055

Re: 401 bearing issues

The motor engine will clearly have moving parts that are somewhat faster , but deos that mean the oil is not appropriate for slower speeds . I would hazard a guess that nobody actually knows and nobody as tested it , it is hifi afterall . But I bet those who pay a fortune for a peppet of snake oil ...
by izzy wizzy
Fri Jun 09, 2023 9:09 am
Forum: Garrard Turntables
Topic: 401 bearing issues
Replies: 69
Views: 50055

Re: 401 bearing issues

Some bearing lubes are meant to provide some drag for the motor to pull against. Some, to fill the gaps in a not so precise bearing. Spin time might not be a measure of goodness in the overall design. My TT bearing and similar designs can use air tool oil. It's a pain but if you can bothered to expe...
by izzy wizzy
Fri Jun 09, 2023 6:18 am
Forum: Garrard Turntables
Topic: 401 bearing issues
Replies: 69
Views: 50055

Re: 401 bearing issues

There is no universal lubricant for bearings. There are so many factors to consider. And as we're talking such super fine tolerances in our measuring machine here, a little (that's a technical term BTW) can make a significant difference. The advice from someone who has experience with a particular b...
by izzy wizzy
Wed Jun 07, 2023 6:32 am
Forum: Assorted Stuff
Topic: Nothing In Particular
Replies: 16439
Views: 4666118

Re: Nothing In Particular

Had a first (for me). The case of an HT dropper resistor, a green welwyn 7W, touched the heatsink on my Lehanne DHT reg which is live. Happened because my construction was poor. R was fed with 230V. Heard some buzzing, blue smoke appeared and then pop, amp stopped working. Fearing the worse, went to...