JTM45 KT66's - too close?

duriehill · Post by **duriehill** » Wed Aug 21, 2013 11:38 am

Hi all

I made a JTM45 a year ago as my first amp build and it occured to me the other day when looking at pictures of the amp that perhaps the KT66's are too close to each other - perhaps damaging the tubes?

What are your thoughts?

[IMG:692:389]http://imageupload.co.uk/files/yzl3h6uslu47rj3qzx85.jpg[/img]

Thanks!

JoeCon · Post by **JoeCon** » Wed Aug 21, 2013 11:55 am

duriehill

GEC states that there should be 3.5 inches between centres. Just measure and see where you sit.

I'm working on a KT66 amp now and put mine 4 inch on center.

duriehill · Post by **duriehill** » Wed Aug 21, 2013 3:10 pm

Thanks

I might look at fixing a small aluminium sheet/plate to cover the kt66 footprint, say 2-3mm depth, to help space them with approx 4" centres.

What do you think? Or maybe no necessary?

ampgeek · Post by **ampgeek** » Wed Aug 21, 2013 3:13 pm

Are you experiencing any issues/unusual behavior in the current configuration?

Cheers,
Dave O.

duriehill · Post by **duriehill** » Wed Aug 21, 2013 3:18 pm

No, I'm not actually, just concerned really that their close proximity could shorten their life.

There doesn't appear to be any physical evidence behind this though.

matt h · Post by **matt h** » Wed Aug 21, 2013 6:42 pm

(deleted)

M Fowler · Post by **M Fowler** » Wed Aug 21, 2013 8:52 pm

Exactly why I'm very careful about buying Marshall chassis.

Mojotone JTM45 is for EL34's not KT66 unless you buy the new bass kit.

Triode JTM 45 is KT66 based and wider spacing. They also have JTM 50 (EL34) version too.

Metro or Valve Storm note there stuff very well and are geared for more accurate clones.

I like Modulus because he puts 4 power tube holes in his chassis and no PT cutout. You can built 100w or 50w, use the extra holes for can caps, etc. And the chassis can be used for JTM45, JCM, or Plexi.

Mark

duriehill · Post by **duriehill** » Wed Aug 21, 2013 9:01 pm

Thanks Mark. Yeah, I didn't realise when I first started this amp (my first build).

I bought this:
http://www.ebay.co.uk/itm/JTM45-replace ... 3cd3e195be

I'm wondering which road I should head down in a resolution because it will probably bug me. I could just replace the chassis or attempt some patch work!?

M Fowler · Post by **M Fowler** » Wed Aug 21, 2013 9:04 pm

Oh yeah forgot about Steve his looks a lot like the Modulus. They are both in EU so I guess that's why they are similiar.

duriehill · Post by **duriehill** » Thu Aug 22, 2013 12:21 pm

Can you guys think of a nifty way to increase the spacing between the KT66's?

Reeltarded · Post by **Reeltarded** » Thu Aug 22, 2013 1:28 pm

Buy a short ruler... maybe.

duriehill · Post by **duriehill** » Thu Aug 22, 2013 2:15 pm

Reeltarded · Post by **Reeltarded** » Thu Aug 22, 2013 2:17 pm

All I got!

M Fowler · Post by **M Fowler** » Thu Aug 22, 2013 3:03 pm

I would just leave the amp alone since it works well.

duriehill · Post by **duriehill** » Thu Aug 22, 2013 3:28 pm

Been browsing pictures of fenders with KT66's, I'm gona live on the edge a little and leave as is.

This is rock after all

The Amp Garage

JTM45 KT66's - too close?

JTM45 KT66's - too close?

Re: JTM45 KT66's - too close?

Re: JTM45 KT66's - too close?

Re: JTM45 KT66's - too close?

Re: JTM45 KT66's - too close?

Re: JTM45 KT66's - too close?

Re: JTM45 KT66's - too close?

Re: JTM45 KT66's - too close?

Re: JTM45 KT66's - too close?

Re: JTM45 KT66's - too close?

Re: JTM45 KT66's - too close?

Re: JTM45 KT66's - too close?

Re: JTM45 KT66's - too close?

Re: JTM45 KT66's - too close?

Re: JTM45 KT66's - too close?