Do you absolutely need a loadbox for recording?

[Webb]

Note to self: Never buy an amp from bmi.

 

[fuzzyguitars]

if you already know everything. Why come to the forum to ask questions.

 

[webrthomson]

I think that i understand that people say it's meh but they don't know what they are talking about and they are not able to make a valid technical conversation about the subject.

Why ask the question if unwilling to listen to the answer?

I assume that you are running the output of your amp into the input of your sound card - this is not what the OT is designed to do, unless your sound card runs at the correct rating for the amp (4,8,16 Ohms) ANY other impedance will damage the windings in the OT and eventually it will burn out, running the amp low will increase the time to burn out but does not stop the damage.

It would seem much more sensible to run the speaker output into a load and use the line outs?

If you don't want to do that, fair play it's your amp and at least when you smell burning and the amp stops working you will know what is wrong with it

 

[cliffc8488]

A 50W Marshall has an impedance ratio of 400 typically for the 8-ohm tap. The 4K input impedance of your sound card therefore will be multiplied by 400 resulting in 1.6 Megohms on the power tube plates. Even the tiniest bit of current through the power tubes will cause huge voltage fluctuations on the plates which can cause the insulation in the output transformer to fail. The longer you run it the higher the likelihood of failure.

IOW what you are doing is stupid and dangerous.

 

[bmi]

A 50W Marshall has an impedance ratio of 400 typically for the 8-ohm tap. The 4K input impedance of your sound card therefore will be multiplied by 400 resulting in 1.6 Megohms on the power tube plates. Even the tiniest bit of current through the power tubes will cause huge voltage fluctuations on the plates which can cause the insulation in the output transformer to fail. The longer you run it the higher the likelihood of failure.

IOW what you are doing is stupid and dangerous.

After half an hour of play the OT is completely cold. You have to tell me how the insulation of the transformer can burn if it is cold.

I will try to check what you say because that will not be the first time that you spread technical bullshit on internet like saying for example that 48khz is enough for sampling based on Shannon's maths.

 

[bmi]

I think that i understand that people say it's meh but they don't know what they are talking about and they are not able to make a valid technical conversation about the subject.

Why ask the question if unwilling to listen to the answer?

I assume that you are running the output of your amp into the input of your sound card - this is not what the OT is designed to do, unless your sound card runs at the correct rating for the amp (4,8,16 Ohms) ANY other impedance will damage the windings in the OT and eventually it will burn out, running the amp low will increase the time to burn out but does not stop the damage.

It would seem much more sensible to run the speaker output into a load and use the line outs?

If you don't want to do that, fair play it's your amp and at least when you smell burning and the amp stops working you will know what is wrong with it

That's the point for the OT :
ANY other impedance will damage the windings in the OT and eventually it will burn out, running the amp low will increase the time to burn out but does not stop the damage.
The level is too small to make the wires hot and burn the insulation placing the OT in short circuit.

 

[cliffc8488]

A 50W Marshall has an impedance ratio of 400 typically for the 8-ohm tap. The 4K input impedance of your sound card therefore will be multiplied by 400 resulting in 1.6 Megohms on the power tube plates. Even the tiniest bit of current through the power tubes will cause huge voltage fluctuations on the plates which can cause the insulation in the output transformer to fail. The longer you run it the higher the likelihood of failure.

IOW what you are doing is stupid and dangerous.

After half an hour of play the OT is completely cold. You have to tell me how the insulation of the transformer can burn if it is cold.

I will try to check what you say because that will not be the first time that you spread technical bullshit on internet like saying for example that 48khz is enough for sampling based on Shannon maths.

Temperature is irrelevant. The insulation fails because of the excessive voltage. It's called withstand or breakdown voltage. 1 mA through your output tubes will induce 1600 volts on the OT. That is enough to punch through the insulation.

Yes, you right, I spread "technical bullshit" on the internet. You on the other hand, don't.

 

[bmi]

A 50W Marshall has an impedance ratio of 400 typically for the 8-ohm tap. The 4K input impedance of your sound card therefore will be multiplied by 400 resulting in 1.6 Megohms on the power tube plates. Even the tiniest bit of current through the power tubes will cause huge voltage fluctuations on the plates which can cause the insulation in the output transformer to fail. The longer you run it the higher the likelihood of failure.

IOW what you are doing is stupid and dangerous.

After half an hour of play the OT is completely cold. You have to tell me how the insulation of the transformer can burn if it is cold.

I will try to check what you say because that will not be the first time that you spread technical bullshit on internet like saying for example that 48khz is enough for sampling based on Shannon maths.

Temperature is irrelevant. The insulation fails because of the excessive voltage. It's called withstand or breakdown voltage. 1 mA through your output tubes will induce 1600 volts on the OT. That is enough to punch through the insulation.

Yes, you right, I spread "technical bullshit" on the internet. You on the other hand, don't.

Perhaps you want to talk about what you said on TGP's forum about Shannon and sampling at 48khz?
Because that's a huge technical bullshit.

 

[cliffc8488]

Perhaps you want to talk about what you said on TGP's forum about Shannon and sampling at 48khz?
Because that's a huge technical bullshit.

Not sure what you are referring to but if I said it I stand behind it. The Nyquist-Shannon sampling theorem is well-proven so I'm not sure what you are ranting about. If it weren't you wouldn't have been able to post that SoundCloud clip in your original post.

 

[webrthomson]

I think that i understand that people say it's meh but they don't know what they are talking about and they are not able to make a valid technical conversation about the subject.

Why ask the question if unwilling to listen to the answer?

I assume that you are running the output of your amp into the input of your sound card - this is not what the OT is designed to do, unless your sound card runs at the correct rating for the amp (4,8,16 Ohms) ANY other impedance will damage the windings in the OT and eventually it will burn out, running the amp low will increase the time to burn out but does not stop the damage.

It would seem much more sensible to run the speaker output into a load and use the line outs?

If you don't want to do that, fair play it's your amp and at least when you smell burning and the amp stops working you will know what is wrong with it

That's the point for the OT :
ANY other impedance will damage the windings in the OT and eventually it will burn out, running the amp low will increase the time to burn out but does not stop the damage.
The level is too small to make the wires hot and burn the insulation placing the OT in short circuit.

Sorry you are simply wrong

From Jeff Bober of Budda amps:

"Tube amps needs to have a load on its output. The AC current and voltage on the primary and secondary sides of the output transformer are directly affected by the load on the secondary side. The optimum conditions exist when the secondary (or output) side of the transformer is properly loaded.

It will cause damage to most transformers if the OT is not loaded for any extended period of time because too much current is being drawn from the transformer. When there is NO load on an output transformer, it attempts to develop more voltage on the secondary side. This can cause the internal insulation of the transformer to break down and high voltage arcing can occur causing shorted turns or open windings!"

TBH there seems little point in debating with you and anyway the side effects of what you are doing will manifest themselves soon enough

 

[jsp]

Guys, it's fine. I dime my amp into my sound card all the time. Go ahead and try it!

 

[jkkkjkhk]

This thread is funny.

Should we start a pool for when his amp croaks?

 

[1big1]

we could. but when it does i'd bet he wouldn't come back and let anybody know.

 

[chunktone]

Running a tube amp with no load, no matter the volume, is like running your engine with no oil in it. You can do it, but it's only a matter of time before it's toast.

There is a load here.

Do what you want. You're loss. Why ask advise when you have no intention of listening.

 

[Anonymous]

Temperature is irrelevant. The insulation fails because of the excessive voltage. It's called withstand or breakdown voltage. 1 mA through your output tubes will induce 1600 volts on the OT. That is enough to punch through the insulation.

This. That is all that needs to be said.

bmi - do whatever you want, but to say because you are running the amp at low volume, what you are doing is not going to hurt your OT at some point is dumb...

This seems like an obvious troll thread to me - whatever floats your boat.

Steve

 

[JTyson]

Poor JMP.... what a waste of a classic amp by a noob who knows everything.

 

[crankyrayhanky]

In the winter, I go up into the wintery hills so that I can connect my amp speaker out cord outside and into a block of ice. Keeps the load nice and chilly without all that abrasive volume associated with cumbersome speaker cabs. Must be safe because it hasn't blown up yet

Once I land my Blades custom, I plan on putting the amp itself right into the snow drift to fully utilize the cup holder while keeping my di load safe.

 

[headlessdeadguy]

Either the guy is just dumb or is trolling.

 

[JTyson]

Either the guy is just dumb or is trolling.

Viva La France

 

[snowdog]

What we've got here is failure to communicate.