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Forum: Vacuum Tubes November 23rd 17, 05:40 PM Posted to rec.audio.tubes
Replies: 0
Views: 486
Posted By [email protected]
World Audio single ended 4W questions

I did a couple of articles on 6080 triode amps sometime back. A pair of 6080's in PP yielded an easy 30W at very low distortion. Looks like a copy of it is still here...
Forum: Vacuum Tubes August 9th 17, 04:32 PM Posted to rec.audio.tubes
Replies: 13
Views: 1,361
Posted By [email protected]
GZ34

On Wednesday, August 9, 2017 at 7:50:14 AM UTC-4, Big Bad Bob wrote:
> On 08/07/17 05:09, Peter Wieck wrote:
> > On Monday, August 7, 2017 at 12:18:50 AM UTC-4, Big Bad Bob wrote:
> > [i]
> >> I...
Forum: Vacuum Tubes August 4th 17, 06:37 PM Posted to rec.audio.tubes
Replies: 8
Views: 1,062
Posted By [email protected]
B Field collapse

In common power supplies the only example where there might be a problem would be that using choke input. The choke likes to keep the current flowing, so a switch between the rectifiers & the choke...
Forum: Vacuum Tubes August 4th 17, 05:39 PM Posted to rec.audio.tubes
Replies: 13
Views: 1,361
Posted By [email protected]
GZ34

The PS transformer is wound serially so that the two sides of the winding are not the same resistance.

I did the work on this all of 20 years ago. The results got published in Glass Audio Volume 10,...
Forum: Vacuum Tubes August 3rd 17, 11:27 AM Posted to rec.audio.tubes
Replies: 8
Views: 1,062
Posted By [email protected]
B Field collapse

On Monday, June 26, 2017 at 5:04:33 AM UTC-4, Xtrchessreal wrote:
> While researching ignitors on gas arc tube lamps I read about how the magnetic field collapses when the circuit is basically opened...
Forum: Vacuum Tubes July 28th 17, 02:16 AM Posted to rec.audio.tubes
Replies: 13
Views: 1,361
Posted By [email protected]
GZ34

I've done both, home grown in Amphenol octal plugs & bought some from New Sensor. All worked OK as long as the power tubes were OK with the higher HV. Some of the power tubes manufactured after the...
Forum: Vacuum Tubes July 10th 17, 10:53 AM Posted to rec.audio.tubes
Replies: 9
Views: 1,274
Posted By [email protected]
BIAS regulation Electro Harmonix KT90 vs Jinvina KT90

On Friday, June 30, 2017 at 7:34:24 PM UTC-4, Xtrchessreal wrote:
> On Sunday, February 12, 2017 at 10:54:08 AM UTC-7, Luigi Vogliobene wrote:
> > Hi to all, I am new in this forum, I own a MingDa...
Forum: Vacuum Tubes May 30th 17, 03:25 PM Posted to rec.audio.tubes
Replies: 5
Views: 1,878
Posted By [email protected]
Tone Burst Testing

On Monday, May 1, 2017 at 5:37:10 AM UTC-4, Patrick Turner wrote:
> Mr Stewart said......
>
> Copy the link & then Google it. That works OK. For me, anyway.
>
> Cheers to all still standing. Back...
Forum: Vacuum Tubes May 23rd 17, 12:17 PM Posted to rec.audio.tubes
Replies: 9
Views: 944
Posted By [email protected]
Replace plate load resistor with plate choke

On Monday, May 22, 2017 at 9:51:03 PM UTC-4, Jim Candela wrote:
> On Monday, May 22, 2017 at 5:38:13 AM UTC-5, wrote:
> > OK Jim, I found a copy of the schematic. The cct is a...
Forum: Vacuum Tubes May 22nd 17, 11:38 AM Posted to rec.audio.tubes
Replies: 9
Views: 944
Posted By [email protected]
Replace plate load resistor with plate choke

OK Jim, I found a copy of the schematic. The cct is a variation on something somewhat common with old guys like us back in the day, convert down to the BC band & use an ordinary receiver to do the...
Forum: Vacuum Tubes April 14th 17, 09:10 AM Posted to rec.audio.tubes
Replies: 5
Views: 1,878
Posted By [email protected]
Tone Burst Testing

On Wednesday, April 12, 2017 at 9:16:35 PM UTC-4, wrote:
> On Thursday, May 2, 2013 at 7:54:38 PM UTC-7, Phil Allison wrote:
> > Hi,
> >
> > my colleague Rod Elliot has designed a...
Forum: Vacuum Tubes March 3rd 17, 12:36 PM Posted to rec.audio.tubes
Replies: 3
Views: 1,279
Posted By [email protected]
Annual Spring Cautionary Post - 2017

On Thursday, March 2, 2017 at 10:32:57 AM UTC-5, Peter Wieck wrote:
> All:
> I have changed the format a bit, and put all the links at the beginning. I am also sending this out a bit earlier than...
Forum: Vacuum Tubes February 19th 16, 11:50 PM Posted to rec.audio.tubes
Replies: 15
Views: 3,597
Posted By [email protected]
Pentode Screen Resistance (rs) Estimation Example

On Wednesday, February 17, 2016 at 7:31:55 PM UTC-5, Patrick Turner wrote:
> On Monday, 1 February 2016 05:37:06 UTC+11, John L Stewart wrote:
> > Measurement of Screen Resistance Example John L...
Showing results 1 to 13 of 13

 

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