#1
As i'm in the process of turning my 6505+ 112 in a head, I figured it's also time to change some of the tubes in it.

I've read a fair few things about what people say about retubing 6505s and come up with a rough list.

Was just wondering whether i'm either deciding on the right positions of tubes/types.
Of course this also has quite a lot of personal preference involved though so there one answer

Pre
V1: JJ ECC803
V2: JJ 5751
V3: JJ 12 AT7
V4: JJ 12 AT7
V5: JJ 12AT7

Power
2 x JJ 6L6

EDIT:

also, as I am probably going to do this over time, what would you recommend being the first change?
#2
are you sure you're wise putting so many low gain tubes in there? I've never retubed a 6505, but yeah.
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#3
yeah not sure about that. i would think the benefits of the 5751 would be best in V1, JJs the rest, and 1x 12at7 last.

i would do like:

tung sol
jj
jj
jj
jan-phillips 12at7

or
5751
jj
jj
jj
jan 12at7
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#4
ECC803 is a good choice in V1. Although, with all those 12AT7 valves, noise wont be as much of a factor as is usually the case with a 6505.
12AT7 NOS tubes are normally cheaper than 12AX7's so go hunting.
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#6
Quote by ambler3
Would you reccomend that I still keep some 12 AX7's Instead of changing them all to AT7's? Cause as Dave mentioned, would it slightly kill my high gain tone if I have so many low gain tubes?

I would go Ecc803 or JAN GE/Phillips 5751 in V1 and the PI and I would keep 12ax7 in the rest of the amp.
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#7
I'm not sure I'd use that many 12AT7s. (Though it may not hurt to try).

Here's what I run in the same amp (and using it as a head):

V1: JJ 5751
V2: JJ ECC83s (12AX7)
V3: JJ ECC83s
V4: JJ ECC83s
V5: JJ 12AT7

V1 and V5 are what affect your tone the most. I have tried the 12AT7 in V1 and the 5751 in V5, and while the cleans were REALLY good for a 6505+, it sounded a bit "dull" on overdrive. It wasn't that it didn't have enough gain, it just didn't have the clarity or bite that I like. Rearranged the way I have listed above, and it's the best of both worlds (clear, sweet tone with plenty of bite, and the cleans are a lot better than a stock 6505+). I just think 3 12AT7s might make for a "dull" sound, but even worse than what I experienced.

I'm also considering running an ECC803 in V1 and move my 5751 to V2 --- so let me know your results!
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Last edited by KailM at Dec 20, 2013,
#8
Quote by Robbgnarly
I would go Ecc803 or JAN GE/Phillips 5751 in V1 and the PI and I would keep 12ax7 in the rest of the amp.
Agreed.
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#10
Keep the power tubes until they start to sound off. They have less impact on sound than V1.
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#12
Quote by ambler3
Great, okay then. For the moment i'll leave the tubes as they are, other than ECC803 up the V1. Thanks for the advice, i'll keep the retube list noted somewhere.

I would also change the PI 12ax7 to a Ecc803 or a 5751. This will help eliminate some hiss in the power section
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#14
i say take the money you were going to spend on power tubes and buy a few extra preamp tunres to try out. 12at7, 5751, perhaps a different type of 12ax7.
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#15
Quote by ikey_
i say take the money you were going to spend on power tubes and buy a few extra preamp tunres to try out. 12at7, 5751, perhaps a different type of 12ax7.


Putting power tubes on hold for the moment. Going to grab a ECC803 and 5751 for V1 & V5.

Besides, i'm not that displeased with the sound as it is..just figured it'd be good to improve the cleans now that I can use a ECC803 and may as well throw a tube for V5 for the same reason while i'm at it.
#16
I've picked up an ECC803 and a 5751 now..but I now need to change them over. How do I do this?

So far i've taken the cover off the V5 tube, but i'm not sure if I should just pull away at it, or try to unscrew the metal bit connected to the chassis, as it feels quite firm, as if it doesn't want to come out.

Just want to make sure i'm not damaging the amp, as i've never changed tubes before.
Last edited by ambler3 at Jan 10, 2014,
#17
Don't unscrew anything. Just pull and wiggle the tube slightly - the sockets will be a bit tight until you've changed tubes a few times. Pay attention to how the pins are on your old tube; align the new tube the same way. You'll know the pins are aligned because it will sort of slip up into place - then push it in.
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#19
Re the power tubes, always remember JJ's are great allrounders. Svet W-C's are tonally amazing, but last as long as a British summer in comparison
#20
Brilliant. Thanks, was feeling a bit of a noob asking this question, as I figured from another video, but was just checking that my amp works the same.

One last question though: pulling tubes with fingers is bad. Myth or truth?
#21
Quote by ambler3
Brilliant. Thanks, was feeling a bit of a noob asking this question, as I figured from another video, but was just checking that my amp works the same.

One last question though: pulling tubes with fingers is bad. Myth or truth?

Myth, if your hands are clean there are no problems. If you want to pull tubes when they are hot use a shirt or rag to get them out (or you will get burnt)
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#22
Even if your hands are a bit dirty it's a myth. Tubes are tough. I've seen tubes that have been working fine for years that looked like they spent the first few years of their life in a Cheetos bag.
But as Rob said, protect your fingers from burning. Hot tubes hurt.
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