Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

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

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daveweyer
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Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

Post by daveweyer » Fri May 10, 2019 9:47 pm

Hi all, just a few catch up items.
We have talked endlessly about the tubes in Jimi's amps, and damn near shut down the forum over the disagreements, but with the photos of a genuine Woodstock Jimi amp sporting West Coast installed 6550s, the argument sort of died down. You know I tried to get beam power tubes in Jimi's amps for several reasons; reliability, loudness, and tone. The tone seems to be the only thing important left, because it is on so many recordings, and no one plays that loud any more anyway.
But you might like to hear it from the source, The Radiotron Designers Handbook 4th edition.
" Beam Power Valves: The second class includes such types as 6L6, 807, and KT66 which differ from pentodes principally in having sharper 'knees' to their plate characteristics, more second harmonic but less third harmonic distortion.....At lower load resistance the second harmonic rises, the third harmonic decreases steadily, and all higher harmonics are negligible....."
So there you have it, one part of the case for beam power tubes versus types like the EL34, which is a pure pentode.
And also a hint about mismatching the OT to the tubes. Everything changes in hard clipping, but that's where it starts.

Now it seems to me we should congratulate ourselves on reaching 100 pages on this topic, we now have a book about Jimi's equipment and West Coast meddling in it. We are also pushing 100,000 views, not the Kardashians, but not too bad for a little amp forum dedicated to unearthing every bit of information about Jimi and his sound. This is about the number of views those little teenage girls get on their porn videos made in their bedrooms. We should be happy to be that popular.

Now, on to the Guild Thunderbass. To be historically significant it has to be a "Quantum Bass", which is different from the others in its use of the 8417 beam power tube, and a regulated screen supply using a small tube whose cathode is connected to the output screens. Tone Seeker says his Quantum bass is junk, and I have to admit, they are kinda cheaply made. You can make them sound good though, just like a Silvertone amp.

Welcome the new members to the forum. Make yourself at home and ask questions.

poppyc
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Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

Post by poppyc » Sun May 19, 2019 12:15 am

Does anyone have information on the Thunderbass head mounting bracket for a Quantum Cab. I'm looking to find one, or fabricate one.

T-Bond
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Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

Post by T-Bond » Mon May 20, 2019 11:30 pm

I just found and joined this forum today.

WOW!! I cannot believe that the man that setup Jimi Hendrix's amps and effects is sharing all of this incredible knowledge and history. Thank you Dave Weyer! What a treat. I have been reading this forum on and off all day, amazing! I started playing guitar in 1969 at 13 and my dad bought me a Stratocaster that year because I ate, slept and breathed everything Jimi Hendrix.

I am an average player on and off for the last 50 years and still play Strat's I have a question for the group: I'm looking to get an original 1960's Marshall head and probably one cabinet. I just bought a 1968 Clyde wah with a serial number just over #200 and am looking for a nice original Univibe and FF. What Plexi 100w head would you guys recommend? I just love the Hendrix sound from beginning to end especially the live stuff, Montery, Woodstock and Band of Gypsies. Thanks for any advice!

Terry Good

daveweyer
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Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

Post by daveweyer » Wed May 22, 2019 12:56 pm

Welcome to the forum! Always nice to have another member. Naturally I recommend a model 1959 with all the West Coast mods (I say ever so modestly, hahahaha), but 45/100s are real popular here too.
We best get Explorer and Bill Bokey to chime in, because they have built these mods and amps. Plus there are resident experts on the gear here who come out of the woodwork every once in a while to offer us some sage advice.
Lot of folks have tried lots of combinations if they are willing to share their results.

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