reverb went out on my twin.

my reverb went out on my fender twin.do i have to take it in to a shop or is there some kind of way of figuring out on my own?am hoping there might be some way to checklist some symptom or cause.its a 1967.

Well Their Are 2 Ways To Tell The Reverb Tube
After That You Will Have To Pull The Unit Out
And Examine It If The Break Is Really Close
To The End It Will Be hardly Worth The Effort
Of Repair But a Tech Can Back That Up Upon Inspection You may Want To Do a Search
On The Spring Reverb Sales That May Help
Replace It But It May Also Change The Tone A Bit

Good Luck