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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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PostPosted: 26 May 2013, 10:49 
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Joined: 08 Dec 2011, 01:17
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I'm planning to replace the output transformers on my K-12G with Edcors. I'm trying to decide between the GXPP10-6-10K and the GXPP15-8-8K, but don't really understand the difference well enough to know why to choose one over the other.

Can you guys provide any guidance on the difference here?

Thank you. This forum has been invaluable! :)

--TWH


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PostPosted: 26 May 2013, 11:55 
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Location: Vänersborg, Sweden
First of all, choose from the XPP or the CXPP-series. The GXPP-series are aimed for guitar amps.

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PostPosted: 26 May 2013, 13:17 
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Thanks for the info. Would the CXPP10-MS-10K be a good match, then? And am I correct in thinking the MS means multiple secondary taps for 4 and 8 ohm loads?

--TWH


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PostPosted: 26 May 2013, 14:13 
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KG12, is that the PP-amp with two 6AQ5? I think that anything around 8K Raa would be fine. A 10K would also work with slightly lower power but also lower distortion.
I I built THIS amp and used XPP-trannies from Edcor. Cannot remember the impedans, but could have been 8K. The transformers I used are among the smallest (power) but the amp can play loud.

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PostPosted: 26 May 2013, 15:09 
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It is a PP amp that uses two 10GV8s per channel.

--TWH


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PostPosted: 01 Jun 2013, 22:01 
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Joined: 04 Jun 2008, 20:59
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Location: Arizona, USA
Hi, By all means use the CXPP10-MS-10Ks. They were custom designed for my amps (both the commercial and diy ones) by Edcor and I allowed open sales of them as they are suitable for a wide variety of tubes including those used in the K series amps. I use them with everything from 6V6s to EL84s. Superior wide band response and low distortion. Unfortunately not cheap. Quality costs.

Good listening
Bruce

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PostPosted: 02 Jun 2013, 04:47 
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Location: Chilliwack, BC
Actually, the GXPP are like the XPP with more inductance!

With the 8K, you'll get more power and with the 10K, you'll get less power but really low distortion.

I've used both anode loads and it's a matter of taste 8-)

Cheers!

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PostPosted: 03 Jun 2013, 19:56 
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I ordered the CXPP10-MS-10K and they apparently arrived today. I'm planning to install them this weekend. Still trying to decide whether to wire them in ultralinear mode due to the added complexity of needing to change the current wiring to the tube sockets.

--TWH


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PostPosted: 03 Jun 2013, 22:05 
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Hi, Even though the U/L connection is a little harder, you will have far better sound. The transformers were designed specifically for best performance as U/L.

Good listening
Bruce

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PostPosted: 03 Jun 2013, 23:04 
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I'm just a little unclear on which traces to cut. I've read that the tubes in the K-12G have a different pinout than the K-12M, so I want to make sure I don't destroy the amp in my attempt to improve it. :)

--TWH


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