• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Dynaco Mark III Kit

Status
Not open for further replies.
Jump to Latest
mhconley

mhconley

Member
Joined 2007
#1
Dynaco Mark III Kit Recommendation

I'd like to build a pair of Dynaco Mark III amplifiers from a kit and have found several available. Has anyone built any of these kits? Any recommendations of one over the others? Any other kits available? Any help, recommendations and comments are most welcome.

The kits I have found in no particular order:
Dynakit Parts: MARK III KIT (120 VAC) - Dynakit Parts
Triode USA: Triode USA Dynaco Mk3 Tube DIY Amp Kit
tubes 4 hifi: Dynaco MK3 PCBs

Thanks,
Martin
 
Last edited:
#3
mhconley said:
I'd like to build a pair of Dynaco Mark III amplifiers from a kit and have found several available. Has anyone built any of these kits? Any recommendations of one over the others? Any other kits available? Any help, recommendations and comments are most welcome.

The kits I have found in no particular order:
Dynakit Parts: MARK III KIT (120 VAC) - Dynakit Parts
Triode USA: Triode USA Dynaco Mk3 Tube DIY Amp Kit
tubes 4 hifi: Dynaco MK3 PCBs

Thanks,
Martin
Click to expand...
dynakit has good support if needed, i think their kit is a fair replica of dynaco,
thus manual & spares will fit and be future safe.
Do use 60/40 tin ( no leadfree !) for ease and good connections. KT88 is
the tube of choice, make sure you get matched pairs ( or a quad) from
a reputable dealer. McShane comes to my mind.
 
#6
Do you need the power? in my opinion the MKIII's are the most compromised of the three power levels of Dyna amps. The simple driver circuit works less and less well as it has to drive bigger and bigger tubes. Have you considered a ST-70 kit? If you are going to do the MKIII, it would be worth looking into non-stock driver circuits.

This is just my opinion, take it with a huge grain of salt.
 
#9
I am open to any and all suggestions. The Mark IV kit looks good, too. I’ve built some solid state designs I’ve found here on diyAudio but this would be my first foray into tubes, hence my desire for a kit. What about pmillett’s 50W “Engineer’s Amp” boards? They look intriguing but may be a little difficult for a first time build.

Thanks for the input.

Martin
 
#13
petertub said:
dynakit has good support if needed, i think their kit is a fair replica of dynaco,
thus manual & spares will fit and be future safe.
Do use 60/40 tin ( no leadfree !) for ease and good connections. KT88 is
the tube of choice, make sure you get matched pairs ( or a quad) from
a reputable dealer. McShane comes to my mind.
Click to expand...

About the 60/40 solder.63/37 is easier to use,it's eutectic meaning liquid and solid phases are very close to each other.Less chance of a component moving while soldering and therefore a better joint.
 
#18
I am leaning toward the Mark IV Dynakit or possibly rebuilding the pair currently on Ebay. A question regarding the 7199 tube. Dynakit has a modification to use a 6GH8A tube or I can get a 6u8 to 7199 adapter. Are both of these viable alternatives? Any preference of one over the other?

Thanks,
Martin
 
#19
IMHO, adapter looks odd. It is a matter of time it will begin to look ugly. I wouldn't modify the 7199 unless the old one is used up and a new cheap pair can't be find. Those old old Dynaco PCB will fall apart the minute you put a soldering tip next to it. If you buy a kit, I would start with 6GH8A.
 
Status
Not open for further replies.
Top Bottom