20 Most Recent Laney RB9 300 Watt Bass Head Questions & Answers

Best to leave the limiter on unless you want to blow the amp and require repairs. Limiters protect the amp and also sometimes the speakers. The limiters reduce the gain when the amp reaches the maximum swing. If the gain were not reduced the amp would "flattop" which results in the circuitry saturating and massive distortion and if this condition is sustained, components can overheat or short out requiring repair. The LED MAY be just an indicator of clipping rather than an indicator of on/off. I downloaded the manual and what I have just said is CORRECT. The LED is a clipping indicator.

There is a caution regarding this amp and the sequence to turn power on. This amp does NOT have good speaker protection and you have to have the gain control down when turning on. The limiter, if you leave it on, might help protect your speakers when powering on. Most good power amps have circuitry to disconnect the speakers while amplifier is powering up and becoming stable, this one does not, so heed the warning and for certain leave the limiter ON... It just might save the amp and your speakers.

I would check C37 & C38. If one is loose or bad connection, there will be 100/120HZ noise.

First, plug your guitar and cable into a different amp to make sure the problem is the amp. Then check to see if you have output from any headphone jack or effects loop. If so your problem is in the power amp section. If not, it's likely the preamp section. Whichever section it is, it will most likely need to go to the shop.

There is a heat sensor on the heatsink (to cooling IC / transistor) which decides current / voltage, in case of overheating. This is indeed to secure IC / transistor power of destruction. The cause of the excessive heat, the impedance mismatch between the amp to the speakers. It is also possible that parts already exist within the amplifier that is almost / half broken, for example, changing the resistor value, electrolytic capacitors are bulging or dried, isolation transformer windings were charred, solder joint cracking etc. Should be checked, before the fatal damage. Heatsink on the amplifier (the picture is owned Connelectronic):

The most likely case is that one of the main output transistors (if which there are many) is shorted. When the protect circuit senses DC on the final output, it will not allow the output relay to come on to protect the speakers from raw DC. With the power removed, you can check between each outputs Emitter and Collector and you will probably find close to zero ohms. From that point you need to unsolder each of the pins of the bad channel until you find the shorted device(s) and replace them.

'pianoforte'

BREV. N. 838420

See page 22 troubleshooting of this manual. It may help you. dd501 (yamaha.com)

Depending on the model, there are four around that date, it could be the insert jacks are tarnished reducing the signal flow between the pre amp stage and digital power amplifier. It could be the power amplifier has failed. It could even be customer error in wiring. This assumes there is the correct level of signal entering the input sockets of course.

Are you sure you are quoting accurately? Could it be one of these instead? http://www.lyrics.cat/lyrics+lead+a+horse+to+water

It's a Line 6 and probably requires a software update from Line 6.

• Price:$1,099.99 on amazon

The Roland RD-600 is a digital piano, and its hammer action mechanism is designed to simulate the feel of an acoustic piano. The hammers in digital pianos like the RD-600 are typically made of materials like plastic or a combination of materials to replicate the weighted feel of acoustic piano keys. The breaking of hammers in a digital piano is not a common issue, and it's not typically related to the age of the instrument alone. Several factors could contribute to the breakage of hammers, and it's essential to consider the following possibilities:

1. Excessive Force: If the keys are played with excessive force or if there's any physical damage to the instrument, it could lead to the breakage of hammers.
2. Material Quality: The quality of materials used in the construction of the hammers can impact their durability. If the hammers are made from subpar materials, they may be more prone to breaking.
3. Manufacturing Defects: In some cases, there could be manufacturing defects that make the hammers more susceptible to breakage.
4. Maintenance: Lack of proper maintenance, such as cleaning and regular inspection, may contribute to the wear and tear of components, including hammers.

If you've observed a pattern of hammers breaking with regularity, it might be worth investigating the specific cause. If it's due to excessive force or physical damage, adjusting playing habits and taking care during transport can help mitigate the issue. As for whether it's worth purchasing new hammers from Roland, it depends on the extent of the damage and the overall condition of the instrument. If the RD-600 is in good condition otherwise and you enjoy playing it, replacing the hammers could be a reasonable option. However, you may want to assess the cost of replacement hammers compared to the overall value of the instrument, factoring in the cost of a used RD-600 and any potential future maintenance needs.