No audio from speaker out

[bpbell]

I’m running my Twin Reverb from the amp to “amp in” and speaker out into the combo’s int. speaker. All was working well. I returned to it after two weeks away and no audio was passing to the speaker. I’ve double checked the wiring and amp settings and there is still no sound passing through. This lack of sound is an issue whether the bypass is on or off. The PS-100 turns on and you can see the tubes glowing.

[dan]

Hi @dpbell and welcome to the forum,

Here are the general guidelines for this situation. Work through these steps and if we don’t catch we can do some some final debug or arrange a service.

NO SOUND

1. Check input cable.
2. Check volume controls.
3. Make sure the amplifier volume and/or gain controls are turned up.
4. Unplug the FX loop, check for sound.
5. Connect a jumper cable from FX send directly to FX return; check for sound.
6. Connect a jumper cable from Line Out directly to Line In; check for sound.
7. PLEASE NOTE: When you have remove the feet to install a rack mount kit, DO NOT REINSTALL JUST THE FEET FIXING SCREWS. This will damage the unit internally and will require factory service. See Rack Kit instructions for details
8. Check speaker cable to see if it is disconnected or shorted.
9. Make sure that the impedance selector is fully engaged in its detent.
10. Check the standby switch.
11. Check for a blown speaker.
12. Check the mains fuse, and replace if necessary. If it blows again, refer to qualified service personnel.

WON’T SWITCH TO OPERATE / NO ATTENUATION

1. Check the mains fuse, and replace if necessary. If it blows again, refer to qualified service
   personnel.
2. Make sure you are using the top TO SPKR output, this must be used first.

[bpbell]

No sound passes through to the speaker on my twin Reverb when I turn the PS operate switch on. When it’s off, the sound passes through. the same is true for the line out in the back. When the operate switch is off, I get a clear signal through to my interface. When it’s switched on, no sound passes through. And yes I’ve checked the line out level.
Please advise
Bryan

[dan]

Hi @bpbell

Thanks for the debug info. This means the PS-100 power amp is not putting out any power. You have eliminated all cable issues (because it works in BYPASS) so this is a real issue with the PS-100.

Before touching the PS-100: disconnect the PS-100 from the wall and wait a few minutes for it to become cool and caps discharge.

Check the mains fuse on the back panel, did it blow? Replace it. See here for the fuses you need:

What fuses do I need for the Power Station PS-2 and PS-100?

Before replacing tubes or the internal fuse on the Power Station see Joe’s video Internal Fuse [PS Internal Fuse] The PS-2 and PS-100 need different internal fuses! PS-100 250V 2A Fast acting / Fast blow 5mm x 20mm Part Number: Littlefuse 0217002.MXP Note: alternative part numbers are OK: 0217002.HXP, 0217002.VXP or 0217002.TXP PS-2 250V 630mA Fast acting / Fast blow 5mm x 20mm Part number: Littlefuse 0217.630MXP Note: alternative part numbers are OK: 0217.630HXP, 0217.630VXP or 0217.630…

If it blows again, check the internal fuse and replace it.

If the internal fuse has blown you probably need to re-tube the PS-100.

• V1 = 12DW7/ECC832
• V2, V3 = 6550 Power tubes (Matched Pair).

FIrst you might want to try replacing the 12DW7 to see it the issue is the driver (if you don’t have a 12DW7 to hand you can test with a 12AX7 but never run the unit like this). If it comes to life then it was the driver. If not, it’s worth changing the power tubes.

[bpbell]

Hi, Dan,
So I’ve replaced all tubes and fuses (to the tune of about $250) and the problem still persists.. When I changed them out, none of them looked like they had blown so this is a more advanced problem. I understand, this has a one-year warranty and this broke during the warranty period. As I’m not spending anymore on a warrantied product I don’t want to ship it to you for repair. I will be in Los Angeles tomorrow and can swing it by your shop. Will that work?

I’m attaching my Vintage King receipt. You’ll see that I contacted you via the forum prior to the one-year anniversary of ownership.
Thanks,
Bryan Bell

(attachments)

Fryette_SalesOrd_21583349.pdf (42.4 KB)

[dan]

Hi @bpbell

There was actually a lot of thought put in to my reply above; there were a few questions and break points. Anyway, for a warranty repair, you need to get an RMA. I think the shop will accept drop-offs, but at least put it in its original box, etc., so it does not get mixed up. But without an RMA number they cannot do anything or track it. Follow the steps here: How can I send my product to Fryette for a repair (RMA Request)? - #2

[bpbell]

Thanks, Dan
I hope nothing I wrote suggested I didn’t think you put thought into your reply. I am frustrated that with only two or three hours of actual use it is suddenly on the fritz. And also spending $250 to eliminate possible failings. Anyway, I’ve email for the RMA.
Thanks,
Bryan