Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Marcus on February 09, 2017, 05:11:21 pm

Title: I have a very sick Splawn Pro Mod. Need a schematic.
Post by: Marcus on February 09, 2017, 05:11:21 pm

I have an '05 Splawn Pro Mod that I just picked up for cheap. It has several burnt resistors and a fried bridge rectifier. I'm lost without a schematic. I tried contacting Scott for just the values of the parts that were burnt and he ignored my email. Any help would be greatly appreciated. Thanks!

Title: Re: I have a very sick Splawn Pro Mod. Need a schematic.
Post by: SILVERGUN on February 09, 2017, 09:18:08 pm

I don't have a schematic for you, but I do have some words of encouragement.
Paraphrasing from Gerald Weber---"you don't need a schematic to fix a tube amp, they basically all do the same thing"
- Pull the power tubes and put them aside...plan on just replacing them, cause tubes wear out anyway, we'll just call it preventive maintenance
- Rebuild the bridge with common values.. 4 - IN4007s will do the trick
- Check the bias supply voltage with power tubes pulled
- Trace where the burnt resistors go and tell us what the location is and we can probably give you an acceptable value to sub in so you can get it up and running.
- Ask questions
- Take your time and create your own schematic . I want a copy.

It ain't rocket science, so don't let it overwhelm you....BUT, if you don't have the experience or confidence to do these things, just take it to a competent tech. He will.
There is a manual in the Hoffman Schematics Library, in case you missed it...I couldn't attach it cause the file was too large. It's here: http://el34world.com/charts/Schematics/files/_Miscellaneous/%20Miscellaneous_Schematics.htm (http://el34world.com/charts/Schematics/files/_Miscellaneous/%20Miscellaneous_Schematics.htm)

Title: Re: I have a very sick Splawn Pro Mod. Need a schematic.
Post by: Tone Junkie on February 10, 2017, 06:34:10 pm

If you go to the SLO-clone forum they probably have it.
Bill

Title: Re: I have a very sick Splawn Pro Mod. Need a schematic.
Post by: HotBluePlates on February 12, 2017, 03:58:40 am

Quote from: SILVERGUN on February 09, 2017, 09:18:08 pm

... There is a manual in the Hoffman Schematics Library, in case you missed it...I couldn't attach it cause the file was too large. It's here: http://el34world.com/charts/Schematics/files/_Miscellaneous/%20Miscellaneous_Schematics.htm (http://el34world.com/charts/Schematics/files/_Miscellaneous/%20Miscellaneous_Schematics.htm)

Don't attach; link.

Splawn Manual Link (http://el34world.com/charts/Schematics/files/_Miscellaneous/Splawn%20Manual%20rev-2-4.pdf)