Dynacord Bassking 1, vintage (1966 or 1967)

[bea]

Vintage Dynacord Bassking 1, all tuebs (most of these amps are hybrid amps, except the oldest). 45W. It suffered from flashovers which i could finally locate in the PI stage between Anode and Grid of the catodyne stage. Tried to clean the socket with lots of Ethanol and replaced the tube by a probably even older from Telefunken, possibly the original tube from the 60s. This is the test run, and i hope the amp remains silent without that loud crackling noise. Keep fingers crossed...



Thats the amp - i made a copy of the wooden headshells available as extra option instead of the common plastic shells of those amps.

I thats successfull, i'll take it to the rehearsal room; its larger cousin (Eminent 2, also all tubes but probably slightly younger) is humming unhappily (cost of ownership of such oldies...)

BTW: here the amp:

 

[BFT Gibson]

Very nice !

 

[bea]

unsuccessful. After more than 1 hour of perfect operation suddenly loud noise again :-(

 

[eSGEe]

poo I was so hoping all would be well......

 

[CabanaBoy]

Gotta say, I really enjoy the work you do making your own instruments as well as reviving and using old amp gear.

 

[bea]

I'currently running the amp without the tube in front of the PI stage. Let's see how long it'll remain silent. Must be for a few hours, i'd guess.

But i guess i might change two coupling caps. One of them will cause trouble because of the sizing demands. That's a real disadvantage of old printed circuits - you depend a lot more on the size and construction of the parts as You do in freely wired circuits. Which makes servicing sometimes difficult.

EDIT: it remained silent for more than 2 hours. So the first thing i have to do seems to be to change the copuling capacitor toward the PI. Although some doubts remain. But luckily i have found a cap with roughly suitable value (a bit too large, but blocking distortion shouldn't be an issue here) and exact size.

 

[eSGEe]

ROCK ON BEA!!!!!!!!!!!!!!!!!!!!!!!!

 

[bea]

Rockin' all over the world (again): possibly two small problems: a defictive trim pot and a broken soldering spot at a tiny cap against HF oscillation. And reinstalled back the two aluminum stripes on the front (most important!). On Monday i'll bring it to the reheasal room; its bigger brother from the same time needs some mainenace, too.