New Tubes for a MKI Herbert and banana plugs infos

[diezel&gas]

hi there and happy new year!! so long i didn't enter on the forum!
soon i'd like to give my mkI Herbert a new set of power tubes ( my has external bias points ), so, which are the suggested and reliable ones to get at the moment? Peter?
i'm currently using stock el 34. never had problems with them.

another question is, what kind of banana plugs do i have to get in order to connect my multimeter lead probes to, into the bias point sockets? are simple banana plugs with screw correct to use?
thanx in advance!

 

[zerotolerance]

Buy full retube set for Herbert from Diezel. It has free shipping around EU. I did that and I can't be happier Just contact them at sales at diezelamplification.com

 

[FourT6and2]

hi there and happy new year!! so long i didn't enter on the forum!
soon i'd like to give my mkI Herbert a new set of power tubes ( my has external bias points ), so, which are the suggested and reliable ones to get at the moment? Peter?
i'm currently using stock el 34. never had problems with them.

another question is, what kind of banana plugs do i have to get in order to connect my multimeter lead probes to, into the bias point sockets? are simple banana plugs with screw correct to use?
thanx in advance!

You should be able to use standard test probes (they look like a long needle) or regular old banana plug probes if you can find them somewhere.

 

[diezel&gas]

Buy full retube set for Herbert from Diezel. It has free shipping around EU. I did that and I can't be happier Just contact them at sales at diezelamplification.com

done! thanx

 

[diezel&gas]

hi there and happy new year!! so long i didn't enter on the forum!
soon i'd like to give my mkI Herbert a new set of power tubes ( my has external bias points ), so, which are the suggested and reliable ones to get at the moment? Peter?
i'm currently using stock el 34. never had problems with them.

another question is, what kind of banana plugs do i have to get in order to connect my multimeter lead probes to, into the bias point sockets? are simple banana plugs with screw correct to use?
thanx in advance!

i have them, exactly the ones in your picture, but i need a pair of banana plugs in order to insert the probes of the DMM firmly and steadly into the Bias measuring points on the amp.
In this video https://www.youtube.com/watch?v=gJeCtSn8UAg the guy is using quick connect banana plugs that are hard to find, so i need to know if common-standard banana plugs ( the ones with a screw on the side ) are correct to use on the lead probes of a digital multimeter.

 

[FourT6and2]

I use the standard needle probes on my Diezel without issue. Banna plugs might be nice to ensure the probes don't fall out. But they aren't necessary. Grainger makes an adapter that you can use to go from standard sheathed plug to banana plug: http://www.grainger.com/product/POMONA- ... s_pp=false You would just have to get a set of test leads that have sheathed plugs on both ends, instead of just one end. I'm getting a set of these because my Diezel is a combo amp and I'm tired of laying the amp down on the ground to bias it. Banana plugs would let me bias the amp right side up, without the probes falling out.

 

[diezel&gas]

thanks, i have to find those banana adapters in a European e-shop, or at a real shop in my city.

which one would you want to get instead? any picture? thanx

 

[FourT6and2]

thanks, i have to find those banana adapters in a European e-shop, or at a real shop in my city.

which one would you want to get instead? any picture? thanx

Grainger is the only place I've found them. I'm sure they can ship internationally.

For your amp, you don't really need banana plugs. You can just use the standard test probe like the one I pictured before that looks like a needle. You can get those anywhere.

 

[Black Sabbath]

. . . so, which are the suggested and reliable ones to get at the moment?

Diezel Herbert power tubes: JJ

 

[diezel&gas]

thanks, i have to find those banana adapters in a European e-shop, or at a real shop in my city.

which one would you want to get instead? any picture? thanx

Grainger is the only place I've found them. I'm sure they can ship internationally.

For your amp, you don't really need banana plugs. You can just use the standard test probe like the one I pictured before that looks like a needle. You can get those anywhere.

i've got them, they came with the DMM of course.
I guess the reading would be inaccurate with the stock probes without some fixed connection. i mean if i just insert the probes inside the reading point as they are, they can slightly move and false the reading.
i never tried that... maybe not

 

[diezel&gas]

. . . so, which are the suggested and reliable ones to get at the moment?

Diezel Herbert power tubes: JJ

thanx! nice nickname BS! they're my favorite band!

 

[Black Sabbath]

thanx! nice nickname BS! they're my favorite band!

Thanx buddy.

Owning a precious Diezel Herbert can at times be cumbersome when selecting power tubes. Mathematically 3! = 6 => six vendors to choose from. After experimenting with the most popular and reliable vendors I settled for the JJ E34L. Great tube, clear, tight, clean, rugged and they bias up nicely at 70mA pair wise.

Your mileage may vary.

 

[diezel&gas]

 

[FourT6and2]

thanks, i have to find those banana adapters in a European e-shop, or at a real shop in my city.

which one would you want to get instead? any picture? thanx

Grainger is the only place I've found them. I'm sure they can ship internationally.

For your amp, you don't really need banana plugs. You can just use the standard test probe like the one I pictured before that looks like a needle. You can get those anywhere.

i've got them, they came with the DMM of course.
I guess the reading would be inaccurate with the stock probes without some fixed connection. i mean if i just insert the probes inside the reading point as they are, they can slightly move and false the reading.
i never tried that... maybe not

Why do you think standard probes would give a false reading? Just stick the probe in and let them hold themselves in the port under their own weight. They will lean against the wall of the test point and secure themselves just fine. If you haven't tried it, you have no reason to think it won't work. That's what most people use on their amps. No issues.

Try it. You'll see that it works just fine.

 

[Rødskjegg]

Buy full retube set for Herbert from Diezel. It has free shipping around EU. I did that and I can't be happier Just contact them at sales at diezelamplification.com

How much did you pay? I need to retube my Herbert soon and this would probably be the best option for me to get new tubes.

 

[diezel&gas]

thanks, i have to find those banana adapters in a European e-shop, or at a real shop in my city.

which one would you want to get instead? any picture? thanx

Grainger is the only place I've found them. I'm sure they can ship internationally.

For your amp, you don't really need banana plugs. You can just use the standard test probe like the one I pictured before that looks like a needle. You can get those anywhere.

i've got them, they came with the DMM of course.
I guess the reading would be inaccurate with the stock probes without some fixed connection. i mean if i just insert the probes inside the reading point as they are, they can slightly move and false the reading.
i never tried that... maybe not

Why do you think standard probes would give a false reading? Just stick the probe in and let them hold themselves in the port under their own weight. They will lean against the wall of the test point and secure themselves just fine. If you haven't tried it, you have no reason to think it won't work. That's what most people use on their amps. No issues.

Try it. You'll see that it works just fine.

that's also true but i like to start doing things having all the correct tools and method to apply the matter

a weird question now, just to know... , what would i read if i test on the bias points, without taking off the corresponding fuse?

 

[duesentrieb]

You would read leaking current in a few mA range

 

[FourT6and2]

i like to start doing things having all the correct tools and method to apply the matter

This is how most people bias their amp:

 

[FourT6and2]

And there's also this thread from 6 years ago: viewtopic.php?f=14&t=25626

 

[Black Sabbath]

If you haven't tried it, you have no reason to think it won't work. That's what most people use on their amps. No issues.

Try it. You'll see that it works just fine.

HELLO!

Master volume @ 0, cook the amp with load for ~5 minutes, DMM in hand (red probe - mA, black probe - COM), probe amp ground 1st, probe 1st amp bias test point 2nd, 200m (ampere) setting on DMM, then flip run "on" adjust bias test point to ~ (65-70)mA pairwise (clockwise colder, counter clockwise hotter) = Rock TF out while the pizza's on its way!