Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: jojokeo on June 08, 2019, 01:43:50 pm

Title: Reverb - quick determinion of input/output connections
Post by: jojokeo on June 08, 2019, 01:43:50 pm

As the question implies: I have a Carvin amp that came without it's tank. After buying a new MOD tank for it, I don't want to take the chassis out of the cab to determine which is the input and which is the output. It works plugged in both ways. But one of the RCA jacks makes noise when touching/holding it and turning up the Reverb control, the other doesn't. So is this the tank's output connection that leads to the recovery triodes, then pi, then power amp section? Just want to confirm. Thanks-

Title: Re: Reverb - quick determinion of input/output connections
Post by: shooter on June 08, 2019, 01:47:47 pm

If just WAG'in I'd say the output rca would buzz b4 the input, or at least with more zeal  :icon_biggrin:

Title: Re: Reverb - quick determinion of input/output connections
Post by: jojokeo on June 08, 2019, 01:53:29 pm

Forgot to add the schematic to help see what it is.

Title: Re: Reverb - quick determinion of input/output connections
Post by: Papa Jim on June 08, 2019, 06:27:26 pm

Can you pull V2 and identify which cable has QC14 as the center pin by measuring R14 (47k) to ground for the Recovery cable.