Silly Question maybe?

[dcgdc5]

The reverb suddenly quit working on my DC5. I know the reverb driver tube is the V5 position. I'm suspecting a tube because when the reverb level knob is turned it changes levels and tone but no reverb is heard. So...looking at the back of the amp do the tubes run V1, V2, V3 etc or V6, V5, V4....
Thanks

 

[Monsta-Tone]

The preamp tubes are the small ones under the aluminum retainer bar.
V1 is closest to the input jack.
V6 is closest to the power switch.

You might also check the cables and tank itself if a new tube doesn't work.