Tokai Forum - a subsidiary of TokaiRegistry.com Forum Index
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Valves

 
Post new topic   Reply to topic    Tokai Forum - a subsidiary of TokaiRegistry.com Forum Index -> Amps
View previous topic :: View next topic  
Author Message
Deadman
Guitar God


Joined: 04 Mar 2006
Posts: 568
Location: England

PostPosted: Mon Sep 25, 2006 12:18 pm    Post subject: Valves Reply with quote

My Marshall AVT50 used to be a great amp. I looked through the vent in the top a couple of years ago to see it glowing away. Recently, it hasn't sounded so good. Lo and behold, today I check the valve and it's lifeless.

I've ordered a JJ Tesla, ?8 odd off Ebay. I'm expecting great things!

What do you guys recommend/use? Obviously this is only a preamp valve (ECC83/12AX7) and I understand that it can get expensive. My old Fender Twin cost me ?75 to revavlve (Groove Tubes).

Lastly, any tips for me? It seems a really simple task to carry out?
Back to top
View user's profile Send private message
luis
Guitar God


Joined: 15 Sep 2001
Posts: 2305
Location: Spain

PostPosted: Mon Sep 25, 2006 12:32 pm    Post subject: Reply with quote

Be aware about new JJ tubes. I have two on my 18 watt clone and one is very microphonic. Buy them from a reputable seller and return them if they became microphonic with some hours of use.
Back to top
View user's profile Send private message
Deadman
Guitar God


Joined: 04 Mar 2006
Posts: 568
Location: England

PostPosted: Mon Sep 25, 2006 12:35 pm    Post subject: Reply with quote

OK Luis.
The ebay store has 100% feedback and they're a top reviewer too. They do a great review of the JJ. I'll be sure to follow your tip though!
Back to top
View user's profile Send private message
Deadman
Guitar God


Joined: 04 Mar 2006
Posts: 568
Location: England

PostPosted: Mon Sep 25, 2006 12:37 pm    Post subject: Reply with quote

Just a quick question:

Is it safe to handle the valve with your bare hands prior to installation? Or do you have to use a cloth/gloves? (like a high-wattage car headlamp bulb)
Back to top
View user's profile Send private message
luis
Guitar God


Joined: 15 Sep 2001
Posts: 2305
Location: Spain

PostPosted: Mon Sep 25, 2006 12:43 pm    Post subject: Reply with quote

I?ve never wear gloves. I use my hands to put them and not problem.
These JJ sounds good enough, specially on a Marshall style amp.
Another beware, one of the JJ 6l6gc I have on my 5e5-A clone went microphonic too after a short period of use again.
Back to top
View user's profile Send private message
bruno
Guitar God


Joined: 19 Feb 2005
Posts: 675
Location: Portugal/Set?bal

PostPosted: Mon Sep 25, 2006 1:34 pm    Post subject: Reply with quote

Got a pair of JJ 6V6's on my tweed deluxe clone, also use their 12ax7 and have a 12au7, never had a problema and they have great tone...

you can handle them with bare hands...

the only time you shouldn't handle them with bare hands is if you have to handle them while hot, because you might hurt yourself (but even that shouldn't be a problem, because tubes should be allowed to cool off before being handled anyways, because you might ruin them if you don't)...
Back to top
View user's profile Send private message
Deadman
Guitar God


Joined: 04 Mar 2006
Posts: 568
Location: England

PostPosted: Tue Sep 26, 2006 2:21 am    Post subject: Reply with quote

OK Bruno, thanks.
The new valve will be here tomorrow. I wonder how much difference there'll be to the tone?
Back to top
View user's profile Send private message
Ozeshin
Guitar God


Joined: 13 May 2006
Posts: 2076

PostPosted: Tue Sep 26, 2006 2:46 am    Post subject: Reply with quote

The reason that you don't handle valves...tubes or glass lamp elements with bare hands is because the oils from your skin leave a film on the glass surface which heats up that particular spot.
Back to top
View user's profile Send private message
Deadman
Guitar God


Joined: 04 Mar 2006
Posts: 568
Location: England

PostPosted: Wed Sep 27, 2006 3:27 am    Post subject: Reply with quote

That was what I thought, Oz. I don't reckon I'll handle it, just in case.
The damn thing was delivered this morning but the postman couldn't fit it through my letterbox. Now I have to wait 6 hours before I can pick it up from the Post Office. Damn! Can't wait to get it installed...the amp sounded, well, even fuzzier last night.
Back to top
View user's profile Send private message
steve2
Plucker


Joined: 19 Nov 2006
Posts: 2

PostPosted: Sun Nov 19, 2006 12:11 pm    Post subject: Reply with quote

luis wrote:
Be aware about new JJ tubes.....


JJ tubes are high quality.
For v1 one has to use a v1-selected tube.
Back to top
View user's profile Send private message
spangled99
Sus4add11


Joined: 24 Jan 2006
Posts: 43

PostPosted: Wed Nov 22, 2006 9:42 am    Post subject: Reply with quote

Ozeshin wrote:
The reason that you don't handle valves...tubes or glass lamp elements with bare hands is because the oils from your skin leave a film on the glass surface which heats up that particular spot.


I've never had a problem with that sort of thing. It might apply to modern car headlamp bulbs, but valves are plenty sturdy enough.
Back to top
View user's profile Send private message
oldflame
Guitar God


Joined: 22 Dec 2003
Posts: 525
Location: Left of centre

PostPosted: Tue Dec 12, 2006 7:49 am    Post subject: Test them Reply with quote

Tube manufacturing these days is a hit and miss game and there is no guarentee that NOS tubes are any better than new ones.

Best thing you can do with tubes is find someone who knows their stuff and see if they have a tube tester. They should be able to match sets up for you.

I have a stack of old NOS tubes in a box. Mullard, Phillips, GEC, Brimar to name a few. Some have been matched up.

Of the newer ones I've found Svetlanas are ok and pretty good value for money. GT's are graded and are usually good but you pay extra for all that fancy stuff.

If you must handle tubes then wipe them gently with a clean cloth before you put them away in a box or just after you put them in your amp. OBVIOULSY, DONT' DO THIS WHEN THEY ARE HOT BECAUSE YOU WILL SURELY REGRET IT.
Back to top
View user's profile Send private message
oldflame
Guitar God


Joined: 22 Dec 2003
Posts: 525
Location: Left of centre

PostPosted: Tue Dec 12, 2006 7:52 am    Post subject: Reply with quote

AND FOR THE THICKO'S OUT THERE.

DON'T EVER HANDLE THEM WHEN THE AMP IS SWITCHED ON AND DON'T EVER USE A DAMP CLOTH TO WIPE THEM.

BETTER STILL...... LEAVE THEM ALONE!
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Tokai Forum - a subsidiary of TokaiRegistry.com Forum Index -> Amps All times are GMT - 6 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group