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Thread: A 1970 hybrid amp

  1. #1
    Ultimate Post Liker solspirit's Avatar
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    Default A 1970 hybrid amp

    Apparently this Hofner KV 40 I have is a hybrid. I know nothing about tube amps or preamps. This should be interesting.

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    Her Little Mojo Minion DankStar's Avatar
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    Default Re: A 1970 hybrid amp

    Does it have a nice 70s overdrive? I’ve never played a Hofner but I love the overdrive of older SS amps (Ross, Rickenbacker, etc) so with a tube pre I’d prob dig it
    Last edited by DankStar; 06-05-2020 at 09:03 PM.

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    Mojo's Minions beaubrummels's Avatar
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    Default Re: A 1970 hybrid amp

    A hybrid amp has a pre amp and a tube amp? I guess I donít know anything about hybrids. Iíve even avoided buying a Prius because I donít want to drive anything that runs on both steam and diesel.
    Quote Originally Posted by Demanic
    Incompetence is widespread in a world that rewards mediocrity while punishing excellence.
    Quote Originally Posted by GuitarFanatic
    I am currently using Skullcandy headphones I found in the garbage.
    I did find the DS-1 in the garbage.
    I once found a guitar amp in the garbage, a Peavey Studio 110. It caught fire at the first gig I played it at.. But it was at the end of it, thank god.

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    Tone Member Bronze Buzzard's Avatar
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    Default Re: A 1970 hybrid amp

    It can actually be two different styles. Some have a tube preamp and solid state power section. Others have a solid state preamp and a tube power section.

    I'll have to look this one up.

    Edit:

    Is this amp the KV40, 2x12 vertical combo by chance?
    Last edited by Bronze Buzzard; 06-05-2020 at 09:54 PM.
    I think I took a wrong turn in Albuquerque...

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    Ultimate Post Liker solspirit's Avatar
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    Default Re: A 1970 hybrid amp

    Quote Originally Posted by Bronze Buzzard View Post
    It can actually be two different styles. Some have a tube preamp and solid state power section. Others have a solid state preamp and a tube power section.

    I'll have to look this one up.

    Edit:

    Is this amp the KV40, 2x12 vertical combo by chance?
    It's hard to find info, I'm pulling my hair out.
    As far as I can tell, I haven't opened it yet. From web research I think it's either a Hofner made by Schaller or a Schaller. Shaller had forward facing controls and I think they stopped production of the KV line in 69 or 70. All the Hofners after 1970 have top mounted controls, so.. it may even be a 69 Schaller. It's been recovered so no badges on it and I can't find any other identifiers without opening it but I'm too busy right now.
    I'm pretty sure it's a tube preamp from what little info I could find.


    Please let me know if you find anything.

  6. #6
    Ultimate Post Liker solspirit's Avatar
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    Default Re: A 1970 hybrid amp

    Quote Originally Posted by DankStar View Post
    Does it have a nice 70s overdrive? I’ve never played a Hofner but I love the overdrive of older SS amps (Ross, Rickenbacker, etc) so with a tube pre I’d prob dig it
    I haven't even really looked, it might. I haven't really had any time to check it out. It was in the pawn shop for $300. Ii plugged it in to make sure it powered up, it did so I offered him $200 and he hemmed and hawed until I was walking out the door and then said OK I'll take $200.

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    Ultimate Post Liker solspirit's Avatar
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    Default Re: A 1970 hybrid amp

    It looks like this.
    https://reverb.com/item/25815572-hof...-40-2x12-combo

    From what I can find out 69 & 70 were the only years with the staggered speakers. I'm not sure if shaller stopped making them in 69 or 70, so... When did Schaller dump all the production on Hofner?.. was it 69 or 70?

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    Ultimate Post Liker solspirit's Avatar
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    Default Re: A 1970 hybrid amp

    When the tool bar gets straightened out I'll post pics.

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    LoveMachineologist jeremy's Avatar
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    Default Re: A 1970 hybrid amp

    what makes you think its a hybrid? doesnt look like it from the schematic

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    Ultimate Post Liker solspirit's Avatar
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    Default Re: A 1970 hybrid amp

    Quote Originally Posted by jeremy View Post
    what makes you think its a hybrid? doesnt look like it from the schematic
    You found a schematic?

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    Ultimate Post Liker solspirit's Avatar
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    Default Re: A 1970 hybrid amp

    When Schaller was selling them they were all tube, around 1969 is when they decided to stop I guess. The 69 Schaller and 70 Hofner look alike with forward facing controls. After 1970 Hofner sold itwith a different configuration and the controls in top as well as the speakers level and not staggered.
    Last edited by solspirit; 06-06-2020 at 01:36 PM.

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    Her Little Mojo Minion DankStar's Avatar
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    Default Re: A 1970 hybrid amp

    Quote Originally Posted by solspirit View Post
    You found a schematic?
    In that reverb link you posted. Shows lots of transistors (not that that’s a bad thing).

  13. #13
    Ultimate Post Liker solspirit's Avatar
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    Default Re: A 1970 hybrid amp

    I might rip it open next weekend if I have time. I'm real curious. I'm searching for anything I can find on the web too but there isn't much.

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    Ultimate Post Liker solspirit's Avatar
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    Default Re: A 1970 hybrid amp

    Quote Originally Posted by jeremy View Post
    what makes you think its a hybrid? doesnt look like it from the schematic
    Some of the things I've read and the fact that it turns on quietly but pops loudly when turned off and takes 30 seconds to power down.

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    Mojo's Minions beaubrummels's Avatar
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    Default Re: A 1970 hybrid amp

    Quote Originally Posted by solspirit View Post
    Some of the things I've read and the fact that it turns on quietly but pops loudly when turned off and takes 30 seconds to power down.
    Sounds like a tube rectified circuit with no standby. Old VOXí do that.
    Quote Originally Posted by Demanic
    Incompetence is widespread in a world that rewards mediocrity while punishing excellence.
    Quote Originally Posted by GuitarFanatic
    I am currently using Skullcandy headphones I found in the garbage.
    I did find the DS-1 in the garbage.
    I once found a guitar amp in the garbage, a Peavey Studio 110. It caught fire at the first gig I played it at.. But it was at the end of it, thank god.

  16. #16
    Ultimate Post Liker solspirit's Avatar
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    Default Re: A 1970 hybrid amp

    Like I said,...
    about tube amps or tubes or valves or whatever.

  17. #17
    Ultimate Post Liker solspirit's Avatar
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    Default Re: A 1970 hybrid amp

    So far this is all I can find and it looks like it's from 1971

    http://schems.com/bmampscom/schaller/KV40.jpg

    Is it solid state?
    Last edited by solspirit; 06-08-2020 at 07:13 AM.

  18. #18
    Her Little Mojo Minion DankStar's Avatar
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    Default Re: A 1970 hybrid amp

    I see a lot of these

    Name:  40D3A161-64AC-463E-A6BF-D36CB3784D49.jpg
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  19. #19
    LoveMachineologist jeremy's Avatar
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    Default Re: A 1970 hybrid amp

    yes, a similar schematic was in the reverb listing and didnt show any tubes. its a ss amp, still worth opening it up and blowing the dust and debris out if nothing else

  20. #20
    Ultimate Post Liker solspirit's Avatar
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    Default Re: A 1970 hybrid amp

    Cool.. thanks a lot guys I'm gonna open it up and blow the dust out but I'm going to take it to a pro to do a once over. It sounds really good just the way it is but I have a feeling if it was tuned up it would sound a lot better.

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