KT88 SE Complete Kit - Page 29

PWR RYD · 15th February 2013, 07:41 PM

Is the schematic in post #126 the latest and greatest?

scott17 · 15th February 2013, 08:04 PM

Yes, that is the latest except for the addition of the LED driver tube bias option.

I have attached the info for that. Whether it sounds "better" with LED bias or conventional RC bias is a personal preference.

There are a couple of other versions of the circuit, one includes plate-to-plate feedback which in my opinion slightly degrades the "open" sound of the amp.

It is important to use the LC filters for the driver tube plates, instead RC filters like in some versions.

scott17 · 15th February 2013, 08:08 PM

Here is the schematic and chassis layout so folks don't have to go search for post #126

Also the choke, L1, for the driver is Hammond part# 155H.

PWR RYD · 15th February 2013, 08:34 PM

Thanks Scott. I am considering scratch building this design with an Allied 6K7VG power transformer and Edcor GXSE15-6-5K output transformers. Will that iron work pretty well? I already have the 5U4GB and KT88's. I also have some 6DJ8s that might work in place of the 6N1P.

scott17 · 15th February 2013, 08:51 PM

Yes, that iron will work well. You will get better frequency response if you use the Edcor CXSE version, although at a substantial cost difference. I used the GXSE in my first build of this version and they do sound good. I believe user "skippyboy" is using the GXSE. Maybe he will chime in here.

Definitely do not use the 6DJ8 in place of the 6N1P for this design. If you need a 6N1P-EV, send me a PM. We can work something out. I have a bunch of them.

Scott

Quote:

Originally Posted by PWR RYD

Thanks Scott. I am considering scratch building this design with an Allied 6K7VG power transformer and Edcor GXSE15-6-5K output transformers. Will that iron work pretty well? I already have the 5U4GB and KT88's. I also have some 6DJ8s that might work in place of the 6N1P.

scott17 · 15th February 2013, 09:14 PM

FYI:

The 6 position terminal strip is Mouser part #534-829TS.

The turret board is Mouser part #534-15293. Comes as 5 sections of 5 positions each.

PWR RYD · 18th February 2013, 12:29 PM

Thanks Scott. How do the custom transformers you supply with your kit compare to the GXSE and CXSE?

scott17 · 18th February 2013, 12:41 PM

Quote:

Originally Posted by PWR RYD

Thanks Scott. How do the custom transformers you supply with your kit compare to the GXSE and CXSE?

They compare to the CXSE. All kits are sold though.

PWR RYD · 4th March 2013, 07:02 PM

I picked up some green LEDs for the driver tube bias. Two in series measure a forward drop of 3.686 V. Is this okay?

scott17 · 4th March 2013, 08:09 PM

Yes, that will work fine.

Quote:

Originally Posted by PWR RYD

I picked up some green LEDs for the driver tube bias. Two in series measure a forward drop of 3.686 V. Is this okay?

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15th February 2013, 07:41 PM	#281
PWR RYD diyAudio Member Join Date: Nov 2009 Location: Rockford, IL	Is the schematic in post #126 the latest and greatest?

15th February 2013, 08:34 PM	#284
PWR RYD diyAudio Member Join Date: Nov 2009 Location: Rockford, IL	Thanks Scott. I am considering scratch building this design with an Allied 6K7VG power transformer and Edcor GXSE15-6-5K output transformers. Will that iron work pretty well? I already have the 5U4GB and KT88's. I also have some 6DJ8s that might work in place of the 6N1P.

15th February 2013, 09:14 PM	#286
scott17 diyAudio Member Join Date: Aug 2009 Location: JFK	FYI: The 6 position terminal strip is Mouser part #534-829TS. The turret board is Mouser part #534-15293. Comes as 5 sections of 5 positions each.

18th February 2013, 12:29 PM	#287
PWR RYD diyAudio Member Join Date: Nov 2009 Location: Rockford, IL	Thanks Scott. How do the custom transformers you supply with your kit compare to the GXSE and CXSE?

4th March 2013, 07:02 PM	#289
PWR RYD diyAudio Member Join Date: Nov 2009 Location: Rockford, IL	I picked up some green LEDs for the driver tube bias. Two in series measure a forward drop of 3.686 V. Is this okay?