Search found 15710 matches
- Wed Nov 12, 2008 5:00 pm
- Forum: Beginners
- Topic: Buffer/unity gain amps.
- Replies: 146
- Views: 57936
Nick, so your buffer as you say feeds straight into a TVA ( a stepped transformer yes?). The way in which you've done that is to maintain the source impedance closer to it's desired value, and thats more desirable than o/p impedance being maintained yes? Almost, The reason I use the buffer is I lik...
- Wed Nov 12, 2008 3:06 pm
- Forum: Beginners
- Topic: Buffer/unity gain amps.
- Replies: 146
- Views: 57936
One thing I don't understand though is how the turning volume control doesn't affect the i/p and o/p impedance's in a buffer amp where as on my pasive pre it's obvious how a big pot strapped across the o/p of the source and i/p of a power amp isn't a good idea. If you have a pot going onto the grid...
- Wed Nov 12, 2008 12:34 pm
- Forum: Valves
- Topic: Heater connection for minimum hum - 6072/12ay7
- Replies: 20
- Views: 15110
- Wed Nov 12, 2008 12:28 pm
- Forum: Buying and Selling
- Topic: bits for mr I's 45 pp amps
- Replies: 34
- Views: 14632
- Wed Nov 12, 2008 12:20 pm
- Forum: Valves
- Topic: Heater connection for minimum hum - 6072/12ay7
- Replies: 20
- Views: 15110
- Wed Nov 12, 2008 11:53 am
- Forum: Valves
- Topic: Heater connection for minimum hum - 6072/12ay7
- Replies: 20
- Views: 15110
With connections to pin 9 and pins 4,5 you're connecting the heaters in parallel. I'd expect that an elevated supply is the way to go. If you're AC heating, I think you should create a virtual centre tap and connect this to the elevated supply, 20V is probably about right. I certainly wouldn't conn...
- Wed Nov 12, 2008 11:47 am
- Forum: Buying and Selling
- Topic: bits for mr I's 45 pp amps
- Replies: 34
- Views: 14632
- Wed Nov 12, 2008 11:45 am
- Forum: Buying and Selling
- Topic: bits for mr I's 45 pp amps
- Replies: 34
- Views: 14632
- Wed Nov 12, 2008 8:08 am
- Forum: Assorted Stuff
- Topic: 8/9th November Owston meet
- Replies: 224
- Views: 84435
- Tue Nov 11, 2008 9:17 pm
- Forum: Buying and Selling
- Topic: bits for mr I's 45 pp amps
- Replies: 34
- Views: 14632
- Tue Nov 11, 2008 4:44 pm
- Forum: Buying and Selling
- Topic: bits for mr I's 45 pp amps
- Replies: 34
- Views: 14632
- Tue Nov 11, 2008 12:40 pm
- Forum: Assorted Stuff
- Topic: Owston Photos - 8/9 November 2008
- Replies: 30
- Views: 17870
It was just a suggestion at best, If you look at it democratically then only those people that don't cache will vote against embedding(likely zero people) and Nick if he's short on disk space(unlikely) so forget I mentioned it... Well, it is a finite resource, so its better if you can, (from my per...
- Tue Nov 11, 2008 10:45 am
- Forum: Assorted Stuff
- Topic: 8/9th November Owston meet
- Replies: 224
- Views: 84435
That's fine, Nick, it's your forum but you might wish to consider the image you're portraying to the outside world and other enthusiasts not part of 'the gang'. I shall say no more about it. Yep, you are right, it is my forum, and I am entirly happy with the image its portraying thanks. Steve: I ho...
- Tue Nov 11, 2008 8:04 am
- Forum: Assorted Stuff
- Topic: 8/9th November Owston meet
- Replies: 224
- Views: 84435
and you're right but an SP10 with a Hadcock arm (Nick's deck) for example is also a commercial product And I should point out I didn't bring the sp10, so I fail to see it as having any relivance? I don't mind honest comments like yours, but some of the other ones on this thread *are* OTT, IMO, and ...
- Tue Nov 11, 2008 1:22 am
- Forum: Valves
- Topic: Andrews PP 45 Amps
- Replies: 18
- Views: 10443