Using 2 EL34's in a Bugera 6260..

Army of 7

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Jan 4, 2016, 2:02:44 AM1/4/16

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This amp has a great, Marshally sounding preamp, unlike most modern Mesa influenced amps. Got a halfstack for a decent price and want a classic rock, hard rock, old-school metal tone, with lots of drive from the power tubes. I know this is a common question, using 2 tubes instead of 4, but the thing is, I don't have a schematic and don't know how ruggedly built the amp is. Some of the older Bugera amps were rated low for build quality but the reviews I've read say the 6260 is built better. It sounds great, even the clean mode at higher gains yields a light overdrive great for SRV type tones, and the clean channel in crunch mode is classic Marshall JCM 800. BTW it does have a 6l6/EL34 switch to accommodate different tubes.

"Angry" Red Boyle

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Jan 4, 2016, 12:25:03 PM1/4/16

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On Monday, January 4, 2016 at 1:02:44 AM UTC-6, Army of 7 wrote:
> This amp has a great, Marshally sounding preamp, unlike most modern Mesa influenced amps. Got a halfstack for a decent price and want a classic rock, hard rock, old-school metal tone, with lots of drive from the power tubes. I know this is a common question, using 2 tubes instead of 4, but the thing is, I don't have a schematic and don't know how ruggedly built the amp is. Some of the older Bugera amps were rated low for build quality but the reviews I've read say the 6260 is built better. It sounds great, even the clean mode at higher gains yields a light overdrive great for SRV type tones, and the clean channel in crunch mode is classic Marshall JCM 800. BTW it does have a 6l6/EL34 switch to accommodate different tubes.

Wouldn't you just pull either the outer or the inner pair of power tubes?

IUnknown

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Jan 4, 2016, 5:53:01 PM1/4/16

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I think he is worried about the ability of the amp to handle the additional strain.

"Angry" Red Boyle

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Jan 4, 2016, 10:17:28 PM1/4/16

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Hard to figure out exactly what the question is. :)

Army of 7

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Jan 5, 2016, 2:31:24 AM1/5/16

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That's it exactly. But a little reading rejuvenated my understanding that the real potential strain would be on the transformer, if the change in impedance wasn't accounted for. Mine is the pre- 'Infinium' version, which apparently had issues with a connector, not solder or board issues. Also, some amps like the Peavey Delta blues run the heaters in series so you can't pull two tubes (why, Hartley?)

jh

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Jan 5, 2016, 6:27:46 AM1/5/16

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...depends on the layout...

Most of the amps (most Fenders and Marshalls) *have* this arrangement
= First PP-side: 1&2 - Second PP-side: 3&4

there are some exceptions - for example some Trace Elliots, where it was
= First PP-side: 1&3 - Second PP-side 2&4

Although i'm pretty sure that Behringer copied the Marshall way - it
should be verified

regards

Jochen

Lord Valve

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Jan 5, 2016, 9:11:44 AM1/5/16

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ROFLMMBFAO! Giddyap!

Universe

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Jan 5, 2016, 11:02:42 AM1/5/16

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Said the self-proclaimed amp-wizard who advocated putting FOUR EL34's
in a Fender Twin! Truly moronic.

The other thing that you missed again: Impedance--your perpetual
nemesis. 6L6's and EL34's usually call for different primary
impedances. Requirements will also change when you use 2 vs 4 output
tubes. Do you happen to know how that relates here? If you don't have
any idea, just say "Fuck off creep" and run away. I will be glad to
explain that to you.

PS: Bonus points: Any idea how impedance is altered when you put four
EL34's in a Twin?

Lord Valve

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Jan 5, 2016, 5:29:16 PM1/5/16

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On Tuesday, January 5, 2016 at 9:02:42 AM UTC-7,Wrinkles the Clown pisseddown his laig:

Fuck off, liar.

richardni...@gmail.com

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Jan 6, 2016, 12:04:34 PM1/6/16

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Speaking of liars, how about posting your client list, bitch.

Lord Valve

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Jan 6, 2016, 9:26:40 PM1/6/16

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Fuck off, creep.

Universe

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Jan 13, 2016, 8:14:01 PM1/13/16

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On Tue, 5 Jan 2016 14:29:15 -0800 (PST), Lord Valve
<ghost....@gmail.com> wrote:

>>>>
>> >> I think he is worried about the ability of the amp to handle the additional strain.

>> >Valve:
>> >ROFLMMBFAO! Giddyap!

>> Universe:

>> Said the self-proclaimed amp-wizard who advocated putting FOUR EL34's
>> in a Fender Twin! Truly moronic.
>>
>> The other thing that you missed again: Impedance--your perpetual
>> nemesis. 6L6's and EL34's usually call for different primary
>> impedances. Requirements will also change when you use 2 vs 4 output
>> tubes. Do you happen to know how that relates here? If you don't have
>> any idea, just say "Fuck off creep" and run away. I will be glad to
>> explain that to you.
>>
>> PS: Bonus points: Any idea how impedance is altered when you put four
>> EL34's in a Twin?
>
>Fuck off, liar.

This is your reflexive comeback when you've been caught. I'm clearly
not lying about anything. You advocated putting four EL34's in a Twin,
despite the drastic overload on the filament supply. This was
apparently rationalized by some conversation with 'a guy' who you
didn't know at Schumacher Transformers 30 years ago.

You also repeated that recently.

As for the impedance thing: Look at tube specs for 6L6's and for
EL34's. Notice anything different in the way the OPT primaries are
spec'd?

Now...how does that relate to the effective impedance of the output
stage?

Lord Valve

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Jan 13, 2016, 10:05:58 PM1/13/16

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On Wednesday, January 13, 2016 at 6:14:01 PM UTC-7, Wrinkles the Clown blubbered:

Are you still looking for God in your colon?

Universe

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Jan 14, 2016, 3:42:16 PM1/14/16

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A strange reply. Here's another hint: What happens when you crank an
amp that has a speaker load that has higher than optimal impedance?

Lord Valve

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Jan 14, 2016, 9:58:16 PM1/14/16

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On Thursday, January 14, 2016 at 1:42:16 PM UTC-7, Rugis verberaretur equus mortuus:

<burp>

Fuck off, creep.

"Angry" Red Boyle

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Jan 16, 2016, 11:56:17 AM1/16/16

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Lardy obviously has no clue what you're talking about.

Lord Valve

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Jan 18, 2016, 9:36:52 AM1/18/16

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Fuck off, creep.

Universe

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Jan 19, 2016, 3:15:40 AM1/19/16

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On Sat, 16 Jan 2016 08:56:14 -0800 (PST), "\"Angry\" Red Boyle"
<artyg...@hotmail.com> wrote:

>On Thursday, January 14, 2016 at 8:58:16 PM UTC-6, Lord Valve wrote:
>> On Thursday, January 14, 2016 at 1:42:16 PM UTC-7, Rugis verberaretur equus mortuus:

> >> As for the impedance thing: Look at tube specs for 6L6's and for
> >> EL34's. Notice anything different in the way the OPT primaries are
> >> spec'd?
> >>
> >> Now...how does that relate to the effective impedance of the output
> >> stage?
>>>

>>> Here's another hint: What happens when you crank an
>> > amp that has a speaker load that has higher than optimal impedance?

>> <burp>
>>
>> Fuck off, creep.
>
>Lardy obviously has no clue what you're talking about.

No, it appears that he doesn't. All his warnings about matching
speaker impedance to the output transformer impedance to avoid
arc'ing--then he posts nonsense about the OT impedance being a
fraction of the speaker impedance. That was of the all-time bat-shit
craziest things ever posted on aga.

The reflected impedance issue is related. If you plug in speakers (or
whatever) with a higher impedance, the undamped delivered energy can
reflect back into the primary ('flyback') and arc across transformer
windings and tube sockets. That's how a lot of Marshalls meet their
end, since their output jack and impedance selector can easily
open-circuit.

But part of that balanced equation has to do with the impedances of
the output tubes themselves. Change the tube type, and it can have
the same kind of effect as plugging in the wrong impedance speakers.

Not to mention that he's gonna toast peoples' power transformers if
they're foolish enough to follow his tube-swap advice. I'm sure he'll
pop in to say "Hasn't happened yet" (that he knows of, maybe). Not a
great argument for justifying Russian Roulette.