The 6550 Experience

His guitar slung across his back, his dusty boots is his cadillac.

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bill bokey
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Re: The 6550 Experience

Post by bill bokey » Tue Sep 11, 2018 7:45 am

A few pics of the amp I just built, a 68 Super Lead replica with Dave Weyer's specs.
Classic Tone choke & PT (1202-43 for a really high B+) and Metro OT (C1998)

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Cab is a Marshall 1960AHW


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https://scontent-cdt1-1.cdninstagram.co ... 3254_n.jpg

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Tek465b
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Re: The 6550 Experience

Post by Tek465b » Tue Sep 11, 2018 9:50 am

Wow it's very neat(inside and ouside), nice wiring job!
I can smell the tolex from here, it bring back memories :).

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Re: The 6550 Experience

Post by revolver1 » Wed Sep 12, 2018 3:12 am

Wow Bill! Inspirational.

Love the West Coast sticker, nice touch. :thumbsup:

So what's the verdict, how does it sound? What speakers are you running?

:clap:

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Re: The 6550 Experience

Post by revolver1 » Wed Sep 12, 2018 3:40 am

Thanks Roe, I'm waiting on the resistors now. I built a little tag board to fit them to, hopefully it'll work. Should be able to connect the pilot lamp here as well.

I'm guessing I'll have to adjust the bias input resistor to get in range also but I assume that would have had to be done anyway to get the cold bias.

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Re: The 6550 Experience

Post by revolver1 » Wed Sep 12, 2018 3:42 am

So Bill, after all your experiments what specs did you settle on?

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bill bokey
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Re: The 6550 Experience

Post by bill bokey » Fri Sep 14, 2018 3:24 am

Tek465b wrote:
Tue Sep 11, 2018 9:50 am
Wow it's very neat(inside and ouside), nice wiring job!
I can smell the tolex from here, it bring back memories :).
Thanks !
revolver1 wrote:
Wed Sep 12, 2018 3:12 am
Wow Bill! Inspirational.

Love the West Coast sticker, nice touch. :thumbsup:

So what's the verdict, how does it sound? What speakers are you running?

:clap:
revolver1 wrote:
Wed Sep 12, 2018 3:42 am
So Bill, after all your experiments what specs did you settle on?
Thanks for the kind words.
It sounds absolutely FANTASTIC !!!! It's the best 'West Coast' I played so far. But it's the first WC I built from scratch, until then I had only modded reissue or vintage amps. With the really high B+ and higher filtering there is punch and tightness like I never heard before. On the lower B+ setting (the PT has two HT secondaries) it sounds like the previous WC I modded.

Specs :
560V+ B+
Filtering : 110/16/32/32/32
Shared cathode V1, 2n2 on V1b
No bypass cap on V2
NFB : 68K / 8 ohm
4n7 bright cap
lead tone stack
bias around 33% Pa (25mA @ 560V)

It's plugged into two cabs, a 90's 1960 (w/ 6402 cones) and a 1960AHW (w/ G12H Heritage).

I'll do my best to make a few clips, if I can find the time....

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Re: The 6550 Experience

Post by Tazin » Sat Sep 15, 2018 3:41 pm

Nice build!

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Re: The 6550 Experience

Post by daveweyer » Sun Sep 16, 2018 12:49 am

Yeah Bill, really nice build. It lights up the forum. Glad to see Tazin is still with us too. When you do a clip for everybody, maybe you could do one with the old 6550s I sent, since there is one of Jimi's old ones in the group it might bring him alive again.
I always love to see these old ideas come to life, and actually have some reinforcement about how good they sound.
Makes me think we might have been on to something way back when.
Bravo!

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bill bokey
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Re: The 6550 Experience

Post by bill bokey » Mon Sep 17, 2018 9:37 am

Thanks !

I doubt I'll find the time to make some clips before the amp is pickep up by its owner but who knows ? ( :jimi: )

But a video of this amp will be released around september 29th, I'll post the link asap ;)

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