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Post subject: 59Bassman Ltd. pulling the V1
Posted: Thu Aug 18, 2011 4:22 am
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hi,

i've heard of black-face mods where the V1 gets pulled out on the normal ch to achieve earlier breakup on the reverb ch. Can the same be done with the 59 Bassman Ltd? How about disabling two speakers to achieve earlier breakup? Any one with experience moding this amp?

thanx

opher


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Post subject: Re: 59Bassman Ltd. pulling the V1
Posted: Thu Aug 18, 2011 6:17 am
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Hi opherlinden,

If you pull V1 from the 59 Bassman, you will get no sound out at all using either channel, as this is the first stage for both channels (half used for normal, half used for bright). As for disconnecting two speakers, this will increase the total impedance and not allow the amp to develop full power (will be 4 ohms with two speakers left connected). You will also lower the total wattage of the speaker load. You could try it with two speakers and see if you like the sound, it will probably just sound as if the volume were turned down as compared to all four speakers. :idea:

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Post subject: Re: 59Bassman Ltd. pulling the V1
Posted: Thu Aug 18, 2011 6:52 am
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Reverb Channel?


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Post subject: Re: 59Bassman Ltd. pulling the V1
Posted: Thu Aug 18, 2011 6:59 am
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"...black-face mods where the V1 gets pulled out on the normal ch to achieve earlier breakup on the reverb ch...."

It seems that the reference is about the Black-face amp's reverb channel. :idea:

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Post subject: Re: 59Bassman Ltd. pulling the V1
Posted: Thu Aug 18, 2011 9:07 am
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shimmilou wrote:
If you pull V1 from the 59 Bassman, you will get no sound out at all using either channel, as this is the first stage for both channels (half used for normal, half used for bright).


+1

Swapping a 12AT7 or a 12AY7 into the V1 position might yield some interesting results.

Arjay

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Post subject: Re: 59Bassman Ltd. pulling the V1
Posted: Thu Aug 18, 2011 10:20 am
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cheers y'all.

Now that you've saved me from frying my amp - is there anyway other than using an attenuator to get earlier breakup?

yours

opher


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Post subject: Re: 59Bassman Ltd. pulling the V1
Posted: Thu Aug 18, 2011 11:20 am
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You could try a pedal.
That was the way I would early break up from mine,
If you crank it up, it is way to loud .
Is it possible to try a 5751 in v1, to lower the gain stage
And allowing you to crank up the amp for a little early break
Up?

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Post subject: Re: 59Bassman Ltd. pulling the V1
Posted: Thu Aug 18, 2011 1:32 pm
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The right set of tubes (preamp and/or output), and/or a hotter bias setting might give you what you want, or closer anyway. Using 6V6 output tubes might be an option to consider, if your amp has an adjustable bias.

GT, for example, offers output tubes rated for, early, medium, or late breakup, as well as preamp tubes sets for more breakup. As Retroverbial suggested, try some different preamp tubes. I believe that the GT 6V6-S will handle the high Plate voltage of the Bassman.

Eurotubes sells tube sets put together specifically for the 59 Bassman RI, for different needs, headroom or early breakup. They also offer JJ 6V6 tubes that are made to handle the Bassman's higher Plate voltage.

The 6V6 would certainly breakup earlier than the 6L6, of course you would lose amp output power going with the 6V6. But if you also don't mind getting breakup at lower volumes, this might be the way to go.

BTW, make sure to turn the amp power off before removing or installing tubes. And you won't harm the amp if you turn it on with tubes already removed. :idea:

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Post subject: Re: 59Bassman Ltd. pulling the V1
Posted: Thu Aug 18, 2011 1:54 pm
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The OP's amp is the Bassman LTD variant with the adjustable bias so he has that base covered. The 6V6 option may indeed be best method of taming the beast.

Arjay

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Post subject: Re: 59Bassman Ltd. pulling the V1
Posted: Fri Aug 19, 2011 10:12 am
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I use a tube screamer with the drive turned way down. I also have the amp turned up to 8 and my guitar down to about half way.


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Post subject: Re: 59Bassman Ltd. pulling the V1
Posted: Fri Aug 19, 2011 10:22 am
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Anyone tried jumping the channels? (or a Y from the guitar, or "stereo" pedal) Getting both halves of V1 going at the same time might give some good preamp distortion. :idea:

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Post subject: Re: 59Bassman Ltd. pulling the V1
Posted: Fri Aug 19, 2011 10:28 am
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I use to use a jumper cable, forgot about that.
Mine use to break a little earlier, however still loud.

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Post subject: Re: 59Bassman Ltd. pulling the V1
Posted: Fri Aug 19, 2011 12:02 pm
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Ive jumped the channels and the amps Mid come through alittle more however still way loud till breakup. Mine however is not an LTD so I dont know if theres a differenc there.


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Post subject: Re: 59Bassman Ltd. pulling the V1
Posted: Sat Aug 20, 2011 2:44 am
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tbazzone wrote:
Ive jumped the channels and the amps Mid come through alittle more however still way loud till breakup. Mine however is not an LTD so I dont know if theres a differenc there.


The "LTD" version shares its pre-amp architecture with the standard 5F6-A re-issue.

HTH

Arjay

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