On Tuesday, December 19, 2023, 4:07 PM, Bob <W4JFABob@...> wrote:

Hi all,

I'll condense this. A friend just got this AL-80B that had?at one time melted a filament tube pin. The tube socket, the type that the socket is on a circuit board, was burned pretty badly. He got a new ceramic socket. I did what I needed to do to install it including getting the grids grounded, socket properly mounted etc.

Amp works fine now but I noticed the cooling fan is basically silent and seems to barely spin. When holding my hand?on the output?vent I barely feel any air movement. I've never worked on one of these 80B's before so I don't know what's normal, however I feel this isn't moving nearly enuff air.

I know this is hard to put into words?but can anyone give me some kind of idea of how much air can be felt blowing out of the vent?

I know the fan worked normally at one time because the inside of this amp was full of dust etc! Actually it was disgusting! It took me quite a while to get it clean.

Thanks all.

Bob? W4JFA

On Tuesday, December 19, 2023, 4:16 PM, Bob <W4JFABob@...> wrote:

Does the fan run at the same speed all the time or is the speed thermostatically?controlled?

Bob? W4JFA

On Tue, Dec 19, 2023 at 4:13?PM Louis Parascondola via <Gudguyham=[email protected]> wrote:

You should be able to feel a steady stream of air coming out the side.

On Tuesday, December 19, 2023, 4:07 PM, Bob <W4JFABob@...> wrote:

Hi all,

I'll condense this. A friend just got this AL-80B that had?at one time melted a filament tube pin. The tube socket, the type that the socket is on a circuit board, was burned pretty badly. He got a new ceramic socket. I did what I needed to do to install it including getting the grids grounded, socket properly mounted etc.

Amp works fine now but I noticed the cooling fan is basically silent and seems to barely spin. When holding my hand?on the output?vent I barely feel any air movement. I've never worked on one of these 80B's before so I don't know what's normal, however I feel this isn't moving nearly enuff air.

I know this is hard to put into words?but can anyone give me some kind of idea of how much air can be felt blowing out of the vent?

I know the fan worked normally at one time because the inside of this amp was full of dust etc! Actually it was disgusting! It took me quite a while to get it clean.

Thanks all.

Bob? W4JFA

On Tuesday, December 19, 2023, 4:16 PM, Bob <W4JFABob@...> wrote:

Does the fan run at the same speed all the time or is the speed thermostatically?controlled?

Bob? W4JFA

On Tue, Dec 19, 2023 at 4:13?PM Louis Parascondola via <Gudguyham=[email protected]> wrote:

You should be able to feel a steady stream of air coming out the side.

On Tuesday, December 19, 2023, 4:07 PM, Bob <W4JFABob@...> wrote:

Hi all,

I'll condense this. A friend just got this AL-80B that had?at one time melted a filament tube pin. The tube socket, the type that the socket is on a circuit board, was burned pretty badly. He got a new ceramic socket. I did what I needed to do to install it including getting the grids grounded, socket properly mounted etc.

Amp works fine now but I noticed the cooling fan is basically silent and seems to barely spin. When holding my hand?on the output?vent I barely feel any air movement. I've never worked on one of these 80B's before so I don't know what's normal, however I feel this isn't moving nearly enuff air.

I know this is hard to put into words?but can anyone give me some kind of idea of how much air can be felt blowing out of the vent?

I know the fan worked normally at one time because the inside of this amp was full of dust etc! Actually it was disgusting! It took me quite a while to get it clean.

Thanks all.

Bob? W4JFA

Maybe a little oil?

On Tuesday, December 19, 2023 at 04:59:54 PM EST, Louis Parascondola via groups.io <gudguyham@...> wrote:

It runs at the same speed

On Tuesday, December 19, 2023, 4:16 PM, Bob <W4JFABob@...> wrote:

Does the fan run at the same speed all the time or is the speed thermostatically?controlled?

Bob? W4JFA

On Tue, Dec 19, 2023 at 4:13?PM Louis Parascondola via <Gudguyham=[email protected]> wrote:

You should be able to feel a steady stream of air coming out the side.

On Tuesday, December 19, 2023, 4:07 PM, Bob <W4JFABob@...> wrote:

Hi all,

I'll condense this. A friend just got this AL-80B that had?at one time melted a filament tube pin. The tube socket, the type that the socket is on a circuit board, was burned pretty badly. He got a new ceramic socket. I did what I needed to do to install it including getting the grids grounded, socket properly mounted etc.

Amp works fine now but I noticed the cooling fan is basically silent and seems to barely spin. When holding my hand?on the output?vent I barely feel any air movement. I've never worked on one of these 80B's before so I don't know what's normal, however I feel this isn't moving nearly enuff air.

I know this is hard to put into words?but can anyone give me some kind of idea of how much air can be felt blowing out of the vent?

I know the fan worked normally at one time because the inside of this amp was full of dust etc! Actually it was disgusting! It took me quite a while to get it clean.

Thanks all.

Bob? W4JFA