The yellow light means that the amplifier is faulty and it needs to be serviced by an electronics technician.

I would say that most of these mk1 amps will be overdue a service now, things like the trimmers, and sometimes the capacitors, but they can also suffer from dried heat transfer compound which results in overheating of the output transistors. Like Graham says your amp needs a service. Tell people where you are located and we can give you an idea of where to get help :)

Thanks for your advise. I will call B&O and see if they can come take a look. appreciated!!🙂

kmjs wrote:

i called B&O and asked for fixing my beosound 2300, they tried to charge me for almost a 1000usd for the cd laser. so i assume its gonna be so expensive for this in this case.

That's the standard answer at B&O shops, if you have a faulty CD player: 'We need to install a new one' (or if it's an older model: 'We can not get spare parts anymore...'). You can be sure, they won't even look at your Penta's.
The only thing they can do these days is to change a module 🙁 They do not repair things anymore on component level. (wonder what kind of education is needed to work at a B&O dealers 'service shop' nowadays...or do they need any..?) 😜 👍

You need to find a decent electronics repair shop, that can actually repair things...

Sounds like the trimmers are slightly out of spec, so that under load the amp is heating up more than normal. Did you notice it being pretty hot to touch? This is a very simple job that any reasonable old school tech should be able to perform for a very reasonable sum of money.

Hi All,

I know this post is a bit old but I have been having a similar problem with my Penta 1s. One of the amps is fine but was getting hotter than normal. The yellow light hadnt come on at all either but wanted to get them tested none the less. I dropped them off today to have them looked at from an old school tech and its only going to run me 120 bucks.

Does anyone know if its easy to replace the surrounds on the mids ?

Hi, it's possibly a potentiometer! Same thing happened on mine the component isn't so expensive it's more labour cost, one of my amps was really hot. the mids are not that tough if your have a competent DIY skill, if your not confident, get someone else to do it 

thanks Nick 

Yeah, I called a place the other day, they want 30 bucks per mid... so that will run me 250 since there are 4 mids per tower. Seems like a bit much just to have the surrounds done. Do you know any reputable places online I can buy the surrounds that will fit the mids ?

Thanks again

Brandyn

I just had a pair of RL140s refurbished (new rubbers, caps) at $400.  Initially I balked at the price, then reconsidered:

- $1200 new

- $2300 in today's money

- 13 to 15 years of service and pleasure you can't put a price on

$400 to have them sounding brand new is not that bad.  Couldn't run a car for that.