Blackstar HT-5 Tube Swap

Discussion - HT-5 amplifiers.
Rhust
Posts: 25
Joined: Wed Apr 10, 2013 2:26 am

Wed Apr 10, 2013 3:11 am

I put in a tungsol 12ax7 and scored 2 NOS delmonico 12bh7a offbeat... This was something like 5 months ago... No re-bias no issues, but ymmv

I also tried a 12au7 (JJ) which cuts the gain by a lot, and gives it a more vintage Marshall tone... Like an early JCM800 when the gain is dimed.

An ehx12ax7 is a little darker than the tung-sol..the tung sol is the perfect balance, to me... I might try a 12at7 though... Just to experiment.

The delmonico, took a rather bland clean channel, and gave it more character, a hair less headroom, and interestingly.. Made the isf and b/m/t knobs more responsive and dynamic on both channels, but especially the clean channel...

Antoon
Posts: 5
Joined: Mon Apr 29, 2013 4:59 pm

Tue Apr 30, 2013 4:39 pm

The stock tubes sound ok to me but..
I tried some other tubes in the pre amp: Mullard, Mazda, EH.
A used Mullard Yellow Legend gave me the best result.
It's a full sound with great lows and a nice smooth grid.
Some Tung Sols are on the way so I will compare them when they arive..

Edit:
Tried the Tung Sols. Nice tubes but not much character in the HT-5. I think Tung Sols are nice general tubes but not in V1 position. In my Shiva I have them in V2 and V3 in V1 I have on old Mazda. In the HT-5 I liked the stock Sovtek better then the TS. I stick with the Mullard because of the rich harmonics en full bodied sound.
Last edited by Antoon on Thu May 02, 2013 3:24 pm, edited 1 time in total.

jeff5
Posts: 12
Joined: Wed Nov 07, 2012 4:32 am

Tue Apr 30, 2013 7:53 pm

Mine came with a Boogie 12AX7. (Sovtek I think) I liked it. Changed to the Tung Sol, didn't like it. Changed back. Tried the Tung Sol again. Liked it for a little while but there is a quality about it I don't like. Especially when palm muting or fast tracking. It almost sounds....flappy. Very hard to explain but there is a quality to it that I just can't get on with.

I may switch back to the Boogie or just get another preamp tube altogether. I also need a new power tube as I haven't replaced it since I got it a year ago!

Antoon
Posts: 5
Joined: Mon Apr 29, 2013 4:59 pm

Wed May 01, 2013 6:01 pm

A year is not long for a powertube..

jeff5
Posts: 12
Joined: Wed Nov 07, 2012 4:32 am

Wed May 01, 2013 6:15 pm

Oh sorry! I meant that it has the same tube in it as when I got it a year ago and I have no idea how long that one was in there for =).

a1terrier
Posts: 192
Joined: Sat Apr 30, 2011 12:00 am
Location: West Yorkshire, England

Thu May 02, 2013 6:30 am

Hi All
Want to put my stock preamp tube back in to my HT5 R Head (Its the one on the left looking into back of head I think) but I am struggling to get it out. Don't want to put too much pressure on it in case I break it. Any suggestions?
Thanks

User avatar
Uffingdon
Posts: 45
Joined: Wed May 04, 2011 12:00 am
Location: Far Side Of Nowhere

Thu May 02, 2013 5:22 pm

a1terrier wrote:I am struggling to get it out. Don't want to put too much pressure on it in case I break it. Any suggestions?
Thanks
"Marigolds" (wife's rubber washing up gloves, honest! :oops: ) they really help to grip that little sucker.

Every gig bag should have a pair!

a1terrier
Posts: 192
Joined: Sat Apr 30, 2011 12:00 am
Location: West Yorkshire, England

Thu May 02, 2013 6:01 pm

Thanks Uffingdon, just hope the neighbours don't see me!!!!

mz3126kl
Posts: 1
Joined: Wed Jun 19, 2013 1:47 pm

Wed Jun 19, 2013 2:02 pm

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Rhust
Posts: 25
Joined: Wed Apr 10, 2013 2:26 am

Wed Jun 19, 2013 2:23 pm

what the fuck does that have to do with tubes?

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