Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: purpletele on October 06, 2019, 11:11:50 am

Title: HoSo 56 With EL84 Schematic?
Post by: purpletele on October 06, 2019, 11:11:50 am

Hey guys,

Been working on a big building renovation. Time to gear up for a couple of amp projects.

I have been playing most of my amps quite a bit, especially the HoSo 56. 

Is there a schematic for the EL84 version, I thought I had seen one but can't locate it.

Thanks

Brian V

Title: Re: HoSo 56 With EL84 Schematic?
Post by: tubenit on October 06, 2019, 03:46:58 pm

You can look at these.  Check for errors!  Make sure the schematic and layout match.  The original one DaGeezer did has a crossline master volume.  You do NOT want a crossline, use a PPIMV instead.

With respect, Tubenit

Title: Re: HoSo 56 With EL84 Schematic?
Post by: tubenit on October 06, 2019, 03:53:45 pm

IF you want to build one with simple paralleled turret style layout   OR   one with active FX on board look at reply #35 on '
this thread:

http://el34world.com/Forum/index.php?topic=6176.0

Title: Re: HoSo 56 With EL84 Schematic?
Post by: purpletele on October 06, 2019, 05:31:07 pm

Quote from: tubenit on October 06, 2019, 03:53:45 pm

IF you want to build one with simple paralleled turret style layout   OR   one with active FX on board look at reply #35 on '
this thread:

http://el34world.com/Forum/index.php?topic=6176.0

Thank you Jeff.  I'm thinking of changing tubes just to try it.

BV

Title: Re: HoSo 56 With EL84 Schematic?
Post by: tubenit on October 06, 2019, 09:04:20 pm

Quote

I'm thinking of changing tubes just to try it.

Not sure if you're wanting to try the 6BM8's or the FX aspect of this? 

Here is an idea for you.  This FX approach is from the HoSo56 Minimalist I did.  Using the cathode follower tone stack as the FX send has worked well for me on several amps now. And by using the mosfet for the CF, you can save yourself an entire dual triode and still have active FX loop.

CHECK for ERRORS!  Compare schematic with layout, if there is a difference go with the schematic.

with respect, Tubenit

**   I drew up an SCH version of what I was referring to. 

Title: Re: HoSo 56 With EL84 Schematic?
Post by: purpletele on October 07, 2019, 11:07:10 am

Quote from: tubenit on October 06, 2019, 09:04:20 pm

Quote

I'm thinking of changing tubes just to try it.

Not sure if you're wanting to try the 6BM8's or the FX aspect of this? 

Here is an idea for you.  This FX approach is from the HoSo56 Minimalist I did.  Using the cathode follower tone stack as the FX send has worked well for me on several amps now. And by using the mosfet for the CF, you can save yourself an entire dual triode and still have active FX loop.

CHECK for ERRORS!  Compare schematic with layout, if there is a difference go with the schematic.

with respect, Tubenit

**   I drew up an SCH version of what I was referring to.

Thanks Jeff,

I have the amp built with 6BM8's and I am think of changing to EL 84's.  That should be pretty simple.

I dig the amp, just tinkering.

BV

Title: Re: HoSo 56 With EL84 Schematic?
Post by: sluckey on October 07, 2019, 11:15:25 am

Got room for another tube socket?

Title: Re: HoSo 56 With EL84 Schematic?
Post by: purpletele on October 07, 2019, 01:12:36 pm

Quote from: sluckey on October 07, 2019, 11:15:25 am

Got room for another tube socket?

I have room, what do you have in mind?

Title: Re: HoSo 56 With EL84 Schematic?
Post by: sluckey on October 07, 2019, 01:48:27 pm

Nothing more than what I asked.

Title: Re: HoSo 56 With EL84 Schematic?
Post by: purpletele on October 07, 2019, 07:11:23 pm

Quote from: sluckey on October 07, 2019, 01:48:27 pm

Nothing more than what I asked.

Good,  I need to get started with something easy where I can’t fry a transformer.