Tube Amp Archive

I have finished overhauling the preamp section of my D-50 and am wondering if it would be worthwhile replacing the grid stoppers to the power tubes from
metal oxide resistors to carbon film ??

Thanks for the input

Dan.

Pulled it out last night. Dropped the snubbers down to 50pF and hated it, went back up to 300pF so a small drop from what was there but this way it still had the smoothness. Changed the phase inverter caps out to some 715 orange drops as well. Will admit its a bit of an annoying amp to work on. Yes...

So, for those following this thread. I came across another D-50 on sale at GC. It was marked down to $719.00 only $40.00 more than the one I purchased used a month ago. So I returned the used one and purchased the new one, now I have one with a warranty. The new amp sounds better than the used one. ...

groovtubin wrote: ↑Fri Apr 16, 2021 12:05 am Had one in house, guy wanted more harmonics on OD channel , added another larger value to V2B cathode, did the trick, ymmv..

may I ask what value cap did you add ?
and by another do you mean , in addition to, or was it substituted ??
Thank you

Plates and cathodes made a big difference for me, YMMV. I am currently playing around with different cathode caps and you'd be surprised at the difference they make :o As Tony states, depending on what you want from the amp, will depend on what resistors and caps you use. Here is a good thread that...

I appreciate all the input. I was thinking about this overnight, and came up with the same conclusion. Someone suggested adding LNFB to V1 but looking at the 183 schematic, I don't think it had it originally ?? what would this give me if I added it ? It was suggested to change Plate and Cathode resi...

Audiodog, Thanks for the info. That's a lot to process. This seems like quite a lot to change. I feel like I might be better off building something from scratch. I suspect the transformers should also be upgraded ?? Maybe I should return it and save up some more money. I guess this was too good to b...

my amp looks just like the photos on page one of this thread, since I re-soldered the caps at the input jack

Dan.

ok, I get that thanks, I do know that with those caps at the input jack disconnected, my bright switch did not work, or at least there was no audible difference. once I reattached the leg of the first cap back on to the end of the resistor, I had a functioning bright switch. My initial question was ...

Phil, Thank you for the response. I guess it never dawned on me that someone might have been inside the amp prior to my purchase. Makes me feel kind of silly now. I understand how a bright cap works across a volume pot, but the caps I was referring to are located at the input jack. Two caps in serie...

Hello All, I haven't been on this forum in a long time, and I mostly hung out on the TW side. So consider this my first post. I have been looking to try a D style amp for a while and I was thinking about getting a Trinity OSD kit, but I happened to find a VHT D50 used at GC so with a 45 day return o...