Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: JayB on April 10, 2010, 05:53:49 pm

Title: My version of a 5 watt.
Post by: JayB on April 10, 2010, 05:53:49 pm

Always wanted a 5 watt with a 12" speaker and bigger cab. Gets a nice ac/dc crunch around 6 on the dial. The sweet spot for me.

Title: Re: My version of a 5 watt.
Post by: JayB on April 10, 2010, 05:54:32 pm

More pics

Title: Re: My version of a 5 watt.
Post by: kagliostro on April 11, 2010, 07:24:19 am

NICE JOB !

Kagliostro

Title: Re: My version of a 5 watt.
Post by: Leevi on April 11, 2010, 08:21:58 am

Excellent work!
Are you going to publish its schematic?
/Leevi

Title: Re: My version of a 5 watt.
Post by: JayB on April 11, 2010, 10:03:32 am

Thanks guys, I believe it's just a tweaked GA-5.

Title: Re: My version of a 5 watt.
Post by: stingray_65 on April 11, 2010, 10:29:07 am

I LOVE small SE amps.

those simple, direct, layouts with minimal parts count and a high enough B+ to allow a bit of OD sounds so good.

Your layout is VERY clean and your construction looks first rate!

I bet it does sound great!

I've always shyed away from a 12, I really don't know why either. That Greeb Back should give a nice almost unexpected volume to that combo.

Title: Re: My version of a 5 watt.
Post by: mat janssen on April 11, 2010, 10:56:47 am

I think that there is a small mistake in the circuit diagram.
The output transformer cannot be connected like you draw.
And the 4 - 8 ohm connections should be altered.

Title: Re: My version of a 5 watt.
Post by: JayB on April 11, 2010, 11:16:08 am

Quote from: stingray_65 on April 11, 2010, 10:29:07 am

I LOVE small SE amps.

those simple, direct, layouts with minimal parts count and a high enough B+ to allow a bit of OD sounds so good.

Your layout is VERY clean and your construction looks first rate!

I bet it does sound great!

I've always shyed away from a 12, I really don't know why either. That Greeb Back should give a nice almost unexpected volume to that combo.

Thanks man. I got 370Vdc on the EL84 plate with this one. Sounds pretty darn good. I tried bringing the voltage down but it just lost it's mojo when I did that. I never really cared for an 8" speaker. They just compress more when pushed to my ears. Guess I don't like to much speaker break up. The green back definitely keeps it open and loud for 5 watts. Roll back the guitar volume and it's a nice clean. It's a cool rock amp.

Title: Re: My version of a 5 watt.
Post by: JayB on April 11, 2010, 11:16:34 am

Quote from: mississippi on April 11, 2010, 10:56:47 am

I think that there is a small mistake in the circuit diagram.
The output transformer cannot be connected like you draw.
And the 4 - 8 ohm connections should be altered.

Good eye!

Title: Re: My version of a 5 watt.
Post by: mat janssen on April 12, 2010, 11:09:42 am

Quote from: JayB on April 11, 2010, 11:16:34 am

Quote from: mississippi on April 11, 2010, 10:56:47 am

I think that there is a small mistake in the circuit diagram.
The output transformer cannot be connected like you draw.
And the 4 - 8 ohm connections should be altered.

Good eye!

Thanks   :grin:

Title: Re: My version of a 5 watt.
Post by: supro66 on April 12, 2010, 11:22:28 am

Quote from: mississippi on April 11, 2010, 10:56:47 am

I think that there is a small mistake in the circuit diagram.
The output transformer cannot be connected like you draw.
And the 4 - 8 ohm connections should be altered.

And only your 10th post

You will be a big help here

Keep up the good work  :smiley:

Title: Re: My version of a 5 watt.
Post by: phsyconoodler on April 12, 2010, 11:22:41 am

Love the name! "THE RUNT"

Nice job!