Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Madison on November 08, 2011, 08:37:12 am

Title: Best way to fry an OT?
Post by: Madison on November 08, 2011, 08:37:12 am

The best way must be through human error, insert me!
Comments and experiences?

I guess I made a boo boo.
I grounded the cathode of my power tubes on a 5E3 build by accident.
I didn't realize until too late.
It must have fried the OT?
Make sense?

After finding that problem, the OT sounded like blocking distortion galore, weak weak weak at high volumes.......if this is what a fried OT sounds like?
Tried everything.

Finally.
I happened to have another OT in the parts box.
Sounds fine now.
New one on order.

I know you guys never make mistakes like this..........

Title: Re: Best way to fry an OT?
Post by: six el six on November 08, 2011, 09:25:47 am

Peanut oil, beer batter. AND it's vegetarian! :icon_biggrin:

Title: Re: Best way to fry an OT?
Post by: LooseChange on November 08, 2011, 10:48:57 am

Forgot to attach a speaker... Once.

Title: Re: Best way to fry an OT?
Post by: Raybob on November 08, 2011, 11:18:46 am

Quote from: SIX el SIX on November 08, 2011, 09:25:47 am

Peanut oil, beer batter. AND it's vegetarian! :icon_biggrin:

Much better with garlic and onions!  :laugh:

Title: Re: Best way to fry an OT?
Post by: bigsbybender on November 08, 2011, 12:02:17 pm

OT's are a rare delicacy. I see far more fried PT's.

j.

Title: Re: Best way to fry an OT?
Post by: JayB on November 08, 2011, 06:04:54 pm

Never fried an OT yet but done the PT though. When I was younger, I've actually blown power tubes up.  :icon_biggrin:

Title: Re: Best way to fry an OT?
Post by: RicharD on November 08, 2011, 07:10:10 pm

I accidentally wired 120V into the filaments.  That was fairly exciting.  Lamp limiters are cool.  No harm done.

Title: Re: Best way to fry an OT?
Post by: shortfuse on November 08, 2011, 10:24:42 pm

wire all pre amp tubes in reverse rotation or backwards on 1st build took out the PT.  Should have listened to Richard because the lamp limiter saved a few other projects on start up afterwards.

Title: Re: Best way to fry an OT?
Post by: eleventeen on November 09, 2011, 08:39:27 am

Intellectually, I know that an OT can be fried by running it with no load. I wouldn't do such a thing, but I have unquestionably done so in the past, and never fried one that I can recall.

Title: Re: Best way to fry an OT?
Post by: Madison on November 09, 2011, 05:58:36 pm

Quote from: SIX el SIX on November 08, 2011, 09:25:47 am

Peanut oil, beer batter. AND it's vegetarian! :icon_biggrin:

ala carte.

Quote from: RicharD on November 08, 2011, 07:10:10 pm

I accidentally wired 120V into the filaments.  That was fairly exciting.  Lamp limiters are cool.  No harm done.

Yeah, I've been getting to ballsy on my start ups.
Need to remember to get out the limiter.

Title: Re: Best way to fry an OT?
Post by: Colas LeGrippa on November 12, 2011, 07:52:39 pm

I was using a MUSIC MAN 100W head to drive a TRAYNOR YBA-1A via the line out, with no loads hooked up to. I gigged a couple of times b4 the music man's OT died...no wonder why . What tone I had, though. Just a dummy load would have saved me the cost of a new OT installed.