KT88

sweet & juicy SE amp for 1626 Darlings and the 6L6 family

Re: KT88

Postby Shannon Parks » Sat Feb 08, 2014 6:46 am

1) With high B+ Clementines, you better change C7, C8, C9 and C10 to 500V caps: Mouser LINK
2) Your voltages at V1 seem incorrect. What is the voltage drop across R9 & R10? After you get me the correct voltages, we'll probably decide to change R22 to 20K or higher.

Shannon
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Re: KT88

Postby noisy » Sat Feb 08, 2014 6:23 pm

Thanks Shannon,
I used 500v caps and now I'll check the voltage drop on R9&R10.
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Re: KT88

Postby noisy » Sat Feb 08, 2014 8:39 pm

Hi Shannon,
I measured the voltage drop at R9 and R10 ,it's 460V before and 455V after.is this ok???

thanks
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Re: KT88

Postby Shannon Parks » Mon Feb 10, 2014 11:00 am

noisy wrote:Hi Shannon,
I measured the voltage drop at R9 and R10 ,it's 460V before and 455V after.is this ok???

thanks


Nope. V1 doesn't seem to be drawing any current. Go ahead and take all voltages on V1 and post them here.

Shannon
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Re: KT88

Postby noisy » Mon Feb 10, 2014 3:09 pm

Thanks Shannon,
I'll give it a go.I'm going to get another meter to make sure!!
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Re: KT88

Postby noisy » Mon Feb 10, 2014 6:08 pm

Hi Shannon,
I bought a new multimeter......wow now i'm feeling like an idiot. the B+ voltage is 488, J5-1 IS 357 and J5-3 is 357VAC. The V1 voltages are
pin1-0v
pin2-478v
pin3-0v
pin4-0v
pin5-478v
pin6-0v
pin7-3.5vac
pin8-3.5vac
the transformer used to drive 2x EL34's PP. I hope this makes sense.
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Re: KT88

Postby Shannon Parks » Wed Feb 12, 2014 10:26 am

noisy wrote:Hi Shannon,
I bought a new multimeter......wow now i'm feeling like an idiot. the B+ voltage is 488, J5-1 IS 357 and J5-3 is 357VAC. The V1 voltages are
pin1-0v
pin2-478v
pin3-0v
pin4-0v
pin5-478v
pin6-0v
pin7-3.5vac
pin8-3.5vac
the transformer used to drive 2x EL34's PP. I hope this makes sense.


Wait a sec. These are *without* a 6SL7 in the socket, right? If so, I think we need to go ahead and "tube it up" and retake voltages.

Shannon
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Re: KT88

Postby noisy » Wed Feb 12, 2014 2:41 pm

Thanks Shannon,
I'll put the valves/tubes in ......
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Re: KT88

Postby noisy » Mon Mar 10, 2014 2:58 pm

196.jpg
196.jpg (958.93 KiB) Viewed 2936 times
I'm back........I finished the amp after getting another transformer,the old one didn't have enough grunt to get the heaters to work. I'm really happy with the sound.Here is a photo from my phone .
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