EL34B replacement

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scunnerlad
Posts: 2
Joined: Fri Jan 27, 2017 12:21 pm

Fri Jan 27, 2017 12:37 pm

I gig with a HT40 and i have a gig later, i have been getting some unwaned noises ( power tube and main tube .... i have hammard this thing :D ) i am yet to order replacements but am worried for unwanted noise through the thing tonight when i play :/ , my friend to the rescue ! he has a spare set of tubes knocking around! yey! the 12ax7 no problems but .......

the main tubes are goove tube standard EL34's

my question is, can i replace a EL34b with a EL34? or will this cause an issue? is the HT40 cathode biased? a matched pair will just throw in ? or am I getting the tester out :evil:

any help would be apriciated

LCW
Posts: 28
Joined: Wed Jan 18, 2017 8:27 pm

Fri Jan 27, 2017 1:35 pm

You might get a quicker response here...

https://www.facebook.com/groups/1428349310511261/

scunnerlad
Posts: 2
Joined: Fri Jan 27, 2017 12:21 pm

Fri Jan 27, 2017 1:38 pm

LCW wrote:You might get a quicker response here...

https://www.facebook.com/groups/1428349310511261/
thankyou LCW have requested and will post when joined

zoziano
Posts: 6
Joined: Fri Oct 12, 2018 1:29 pm

Tue Nov 13, 2018 5:49 pm

I'm pretty sure that no amp mods are necessary, though a rebias probably will be. You should also make sure that they'll physically fit as KT-77s are larger than most EL-34s

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