Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: markmalin on January 08, 2019, 06:28:11 am

Title: Do I need a coupling cap on the output of this circuit?
Post by: markmalin on January 08, 2019, 06:28:11 am
Hey all,


I've built this pedal which is the "183" D-style pre-amp. I don't have an accurate schematic drawn yet, but here's a hacked up schematic if you'll ignore the power section.  I have implemented my tube pre-amp pedal pretty much just like this, except with a bypass DPDT switch.  My question is, do I need a cap before the output to bock DC?  I've been running it as-is and it works fine, but woke up in the middle of the night thinking "dang! I think I need something to block DC on the output before going in to an amp input!"


Humbly,
Mark
Title: Re: Do I need a coupling cap on the output of this circuit?
Post by: sluckey on January 08, 2019, 06:40:57 am
No need for a cap. C10 and C16 have already blocked any dc from the output jack.
Title: Re: Do I need a coupling cap on the output of this circuit?
Post by: markmalin on January 08, 2019, 06:42:30 am
Quote from: sluckey on January 08, 2019, 06:40:57 am
No need for a cap. C10 and C16 have already blocked any dc from the output jack.


Thanks, Slucky. I'll go back to bed now :)
Title: Re: Do I need a coupling cap on the output of this circuit?
Post by: DummyLoad on January 08, 2019, 07:04:31 am
the fuse block - zip tied to a filter cap... lol!


--pete
Title: Re: Do I need a coupling cap on the output of this circuit?
Post by: markmalin on January 08, 2019, 07:16:21 am
Quote from: DummyLoad on January 08, 2019, 07:04:31 am
the fuse block - zip tied to a filter cap... lol!

--pete


I know, I know...I was impatient to get it up and running and there's so little room in there!  lol.
Here - I'll post a picture of the "other side" to redeem myself...
Title: Re: Do I need a coupling cap on the output of this circuit?
Post by: markmalin on January 08, 2019, 07:18:39 am
so Pete....other than that, if you see anything blatantly stupid in there, please point it out!  I'm always open to advice :)  (just ignore the fuse for now!)