Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: TIMBO on December 23, 2015, 04:09:32 am

Title: An interesting twist
Post by: TIMBO on December 23, 2015, 04:09:32 am

Hi guys, This has tweaked my interest............
http://www.ozvalveamps.org/maxim/maxim_chassis_undersk.jpg (http://www.ozvalveamps.org/maxim/maxim_chassis_undersk.jpg)

Thinking that there is a bit of Marshall Major in its roots and I have some hardware looking for a build.
There is little info with this amp, so there may be a similar circuit floating around out in cyber schematic land.

Title: Re: An interesting twist
Post by: sluckey on December 23, 2015, 05:31:51 am

I was expecting a Chubby Checker story!   :icon_biggrin:

Title: Re: An interesting twist
Post by: TIMBO on December 25, 2015, 03:08:56 pm

https://www.youtube.com/watch?v=pHGXwQeUk7M (https://www.youtube.com/watch?v=pHGXwQeUk7M)

I can't say I have had the pleasure of doing this dance but my wife danced with him in the early 80's

I was able to jag a copy of the Maxim amp, this is a bit different to the one featured on Ozvalves.
(http://i761.photobucket.com/albums/xx254/Timbo-08/001%203_10.jpg) (http://s761.photobucket.com/user/Timbo-08/media/001%203_10.jpg.html)
(http://i761.photobucket.com/albums/xx254/Timbo-08/002%203_8.jpg) (http://s761.photobucket.com/user/Timbo-08/media/002%203_8.jpg.html)

Title: Re: An interesting twist
Post by: Fresh_Start on December 26, 2015, 10:49:49 am

Never saw a tremolo circuit that diddled a pentode's screen grid before but why not?

That's an interesting circuit.

Chip

Title: Re: An interesting twist
Post by: kagliostro on December 27, 2015, 01:08:04 am

Ciao TIMBO

Quote

I can't say I have had the pleasure of doing this dance .....

I've never been a great or passionate dancer, but I had that pleasure  :smiley:


! No longer available (http://www.youtube.com/watch?v=fJpC2OixZVE#)

--

Fresh_Start if you want to see something quite odd ....

(http://www.ozvalveamps.org/playmaster/pm103cctamp_2joe.jpg)

our australian cousins are very inventive   :thumbsup: :icon_biggrin:

--

TIMBO I see something that I don't understand on the schematic you posted, the junction between channel 1 and 2 done after the 100k resistors and before the 330p and .047uf caps (???)

Franco

Title: Re: An interesting twist
Post by: TIMBO on December 27, 2015, 03:27:36 am

Hi K,
I think the idea behind that is the original amp http://rickveneer.com/wp-content/uploads/2015/12/Maxim-3S.jpg (http://rickveneer.com/wp-content/uploads/2015/12/Maxim-3S.jpg) has two inputs
One input would have a three position rotary sw. that would give you HI/LO/BOTH on the tremolo channel and the other input for the other channel

Title: Re: An interesting twist
Post by: kagliostro on December 27, 2015, 07:45:18 am

I see, that has sense

Franco

Title: Re: An interesting twist
Post by: TIMBO on December 27, 2015, 02:44:15 pm

Hi K, I'm wrong!!!!!
That rotary sw is for the bright caps on the volume pot.
I think it's just a way to have a HI/LO input.  :icon_biggrin:

Title: Re: An interesting twist
Post by: kagliostro on December 27, 2015, 02:52:47 pm

Mmmmmm ????? ....  :rolleyes: :rolleyes: :rolleyes: :rolleyes:


Yes, the jumper (on the schematic) is only to connect the signal of each input to both the Tone Controls


Franco