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Gilette

Joined: May 04, 2014
Posts: 734
Montserrat

Posted on Apr 11 2018 07:50 AM

There's a guy here in the Netherlands who understands transformers. He might know what you need. http://www.marble-amps.com/transformers/

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Tqi

Joined: Dec 07, 2014
Posts: 1222
2 Security Pins

Posted on Apr 11 2018 10:59 AM

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Last edited: Jan 31, 2024 15:51:40

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Tqi

Joined: Dec 07, 2014
Posts: 1222
2 Security Pins

Posted on Apr 11 2018 11:15 AM

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Last edited: Jan 31, 2024 15:51:45

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Gilette

Joined: May 04, 2014
Posts: 734
Montserrat

Posted on Apr 11 2018 02:26 PM

Whoops, sorry, didn't read the long copy. Thought you were still looking for transformers. Great score on the tapped pots though...

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Tqi

Joined: Dec 07, 2014
Posts: 1222
2 Security Pins

Posted on Apr 11 2018 07:12 PM

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Last edited: Jan 31, 2024 15:51:50

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Tqi

Joined: Dec 07, 2014
Posts: 1222
2 Security Pins

Posted on Apr 15 2018 11:59 AM

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Last edited: Jan 31, 2024 15:51:54

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Redfeather

Joined: Jul 30, 2016
Posts: 896
3 Download Pins

Posted on Apr 16 2018 07:08 PM

Yeah, I looked into how my Carvin achieves its 50% and 25% power modes and it turns out that it doesn't actually drop any tubes to do it. (I think) I read somewhere that the 25% setting switches to triode operation and it certainly succeeds in dropping the volume and headroom. I'd describe it as way less than half volume. At full power, full volume the thing shakes the entire building but in 25% mode it's totally "bedroom" level even cranked.

In short, I think you're onto something there! I haven't read through that entire webpage yet but it's still in the queue.

And in other news, a package just came in from Down Under...

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Tqi

Joined: Dec 07, 2014
Posts: 1222
2 Security Pins

Posted on Apr 16 2018 09:09 PM

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Last edited: Jan 31, 2024 15:51:59

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Tqi

Joined: Dec 07, 2014
Posts: 1222
2 Security Pins

Posted on Apr 20 2018 09:14 PM

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Last edited: Jan 31, 2024 15:52:04

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Tqi

Joined: Dec 07, 2014
Posts: 1222
2 Security Pins

Posted on Apr 23 2018 10:15 PM

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Last edited: Jan 31, 2024 15:52:09

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Tqi

Joined: Dec 07, 2014
Posts: 1222
2 Security Pins

Posted on Apr 24 2018 06:19 AM

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Last edited: Jan 31, 2024 15:52:12

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Tqi

Joined: Dec 07, 2014
Posts: 1222
2 Security Pins

Posted on Apr 26 2018 06:55 PM

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Last edited: Jan 31, 2024 15:52:20

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Tqi

Joined: Dec 07, 2014
Posts: 1222
2 Security Pins

Posted on Apr 27 2018 12:08 PM

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Last edited: Jan 31, 2024 15:52:25

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Tqi

Joined: Dec 07, 2014
Posts: 1222
2 Security Pins

Posted on Apr 28 2018 05:40 PM

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Last edited: Jan 31, 2024 15:52:32

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crumble

Joined: Sep 09, 2008
Posts: 3158
Guildford England
United Kingdom

Posted on Apr 28 2018 06:31 PM

Just in case you've never used aviation spec Teflon wire before, good luck cutting and wrestling it into position! It's very nice stuff though, I'll be watching to see how you deal with it - from the perspective of me learning something that is.

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Tqi

Joined: Dec 07, 2014
Posts: 1222
2 Security Pins

Posted on Apr 29 2018 06:23 AM

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Last edited: Jan 31, 2024 15:52:37

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Tqi

Joined: Dec 07, 2014
Posts: 1222
2 Security Pins

Posted on May 02 2018 04:09 PM

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Last edited: Jan 31, 2024 15:52:43

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tubeswell

Joined: Sep 24, 2011
Posts: 1424
Wellington, NZ
Antarctica

Posted on May 05 2018 02:31 AM

Are those Russian 6Н2П?

If so, be aware that those have a different heater pin-out to the 12A_7 types. (6.3V filament is between pins 4 and 5. 9 is the shield)

—

He who dies with the most tubes... wins

Surf Daddies

Last edited: May 05, 2018 02:34:48

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Tqi

Joined: Dec 07, 2014
Posts: 1222
2 Security Pins

Posted on May 05 2018 03:20 AM

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Last edited: Jan 31, 2024 15:52:48

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Tqi

Joined: Dec 07, 2014
Posts: 1222
2 Security Pins

Posted on May 14 2018 06:45 PM

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Last edited: Jan 31, 2024 15:52:55

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Gilette Joined: May 04, 2014 Posts: 734	Posted on Apr 11 2018 07:50 AM There's a guy here in the Netherlands who understands transformers. He might know what you need. http://www.marble-amps.com/transformers/ Top
Tqi Joined: Dec 07, 2014 Posts: 1222	Posted on Apr 11 2018 10:59 AM - Last edited: Jan 31, 2024 15:51:40 Top
Tqi Joined: Dec 07, 2014 Posts: 1222	Posted on Apr 11 2018 11:15 AM - Last edited: Jan 31, 2024 15:51:45 Top
Gilette Joined: May 04, 2014 Posts: 734	Posted on Apr 11 2018 02:26 PM Whoops, sorry, didn't read the long copy. Thought you were still looking for transformers. Great score on the tapped pots though... Top
Tqi Joined: Dec 07, 2014 Posts: 1222	Posted on Apr 11 2018 07:12 PM - Last edited: Jan 31, 2024 15:51:50 Top
Tqi Joined: Dec 07, 2014 Posts: 1222	Posted on Apr 15 2018 11:59 AM - Last edited: Jan 31, 2024 15:51:54 Top
Redfeather Joined: Jul 30, 2016 Posts: 896	Posted on Apr 16 2018 07:08 PM Yeah, I looked into how my Carvin achieves its 50% and 25% power modes and it turns out that it doesn't actually drop any tubes to do it. (I think) I read somewhere that the 25% setting switches to triode operation and it certainly succeeds in dropping the volume and headroom. I'd describe it as way less than half volume. At full power, full volume the thing shakes the entire building but in 25% mode it's totally "bedroom" level even cranked. In short, I think you're onto something there! I haven't read through that entire webpage yet but it's still in the queue. And in other news, a package just came in from Down Under... Top
Tqi Joined: Dec 07, 2014 Posts: 1222	Posted on Apr 16 2018 09:09 PM - Last edited: Jan 31, 2024 15:51:59 Top
Tqi Joined: Dec 07, 2014 Posts: 1222	Posted on Apr 20 2018 09:14 PM - Last edited: Jan 31, 2024 15:52:04 Top
Tqi Joined: Dec 07, 2014 Posts: 1222	Posted on Apr 23 2018 10:15 PM - Last edited: Jan 31, 2024 15:52:09 Top
Tqi Joined: Dec 07, 2014 Posts: 1222	Posted on Apr 24 2018 06:19 AM - Last edited: Jan 31, 2024 15:52:12 Top
Tqi Joined: Dec 07, 2014 Posts: 1222	Posted on Apr 26 2018 06:55 PM - Last edited: Jan 31, 2024 15:52:20 Top
Tqi Joined: Dec 07, 2014 Posts: 1222	Posted on Apr 27 2018 12:08 PM - Last edited: Jan 31, 2024 15:52:25 Top
Tqi Joined: Dec 07, 2014 Posts: 1222	Posted on Apr 28 2018 05:40 PM - Last edited: Jan 31, 2024 15:52:32 Top
crumble Joined: Sep 09, 2008 Posts: 3158 Guildford England	Posted on Apr 28 2018 06:31 PM Just in case you've never used aviation spec Teflon wire before, good luck cutting and wrestling it into position! It's very nice stuff though, I'll be watching to see how you deal with it - from the perspective of me learning something that is. Top
Tqi Joined: Dec 07, 2014 Posts: 1222	Posted on Apr 29 2018 06:23 AM - Last edited: Jan 31, 2024 15:52:37 Top
Tqi Joined: Dec 07, 2014 Posts: 1222	Posted on May 02 2018 04:09 PM - Last edited: Jan 31, 2024 15:52:43 Top
tubeswell Joined: Sep 24, 2011 Posts: 1424 Wellington, NZ	Posted on May 05 2018 02:31 AM Are those Russian 6Н2П? If so, be aware that those have a different heater pin-out to the 12A_7 types. (6.3V filament is between pins 4 and 5. 9 is the shield) — He who dies with the most tubes... wins Surf Daddies Last edited: May 05, 2018 02:34:48 Top
Tqi Joined: Dec 07, 2014 Posts: 1222	Posted on May 05 2018 03:20 AM - Last edited: Jan 31, 2024 15:52:48 Top
Tqi Joined: Dec 07, 2014 Posts: 1222	Posted on May 14 2018 06:45 PM - Last edited: Jan 31, 2024 15:52:55 Top

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