ADA Power Amps > T100s

Does preamp size affect output level?

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rnolan:
The T100S should be very loud and blow the B* speaker away.  Sounds like there are issues with the pots and probably the jacks.  Give them all a good clean and also the jacks on the split stacks, they can gum up if not used for a while.  You need an insert lead (stereo jack to 2 x mono) then you can test using the DI outs.  As they are for headphone/cab sim they will lack top end so you'll have to turn the treble up a bit to compensate.  If you buy a stereo Fx you should be able to use the Fx send into one channel but both outputs should work to plug into the T100S.

assquatch20:

--- Quote from: rnolan on January 28, 2019, 09:51:41 PM ---The T100S should be very loud and blow the B* speaker away.  Sounds like there are issues with the pots and probably the jacks.  Give them all a good clean and also the jacks on the split stacks, they can gum up if not used for a while.  You need an insert lead (stereo jack to 2 x mono) then you can test using the DI outs.  As they are for headphone/cab sim they will lack top end so you'll have to turn the treble up a bit to compensate.  If you buy a stereo Fx you should be able to use the Fx send into one channel but both outputs should work to plug into the T100S.

--- End quote ---

To be fair, the 5w amp is going through a 4x12 so they have equal surface area at least. I'll give it a cleaning and test tubes and such though. I think, according to Blackstar, I need a balanced cable for the DI. The speaker emulation is a bummer, but the stereo reverb might sound nice. Regarding the loop and stereo fx, that's what I'm currently doing. The only effect I have for now is a stereo tremolo but it is pretty fun. And to be fair it sounds great, it's like the power is scaled to match the preamp it's feeding from somehow. I wish someone that had one of these and a small amp could verify whether or not this is normal.

rnolan:
The T100S output:85w per ch -> 4 ohm50w per ch -> 8 ohm (which I assume the split stacks are)25w per ch -> 16 ohmThey have 3 tubes per chan, 1 12AX7 driver (phase splitter) and 2 6CA7 (=EL34) power tubes
This should much louder than the 5w blackstar (double the volume takes 10 x the power ie 50w vs 5w). In your case you have 2 x 50w so add 3db to twice as loud. However, as the T100S input is just one 12AX7 phase splitter you need to drive it pretty hard as there is no additional gain at its input.
The lead you need for the cab sim/phones output is a standard stereo to double mono shielded lead (there's a wiring diagram in the B* manual showing the stereo end).  They are more commonly known as insert leads as that is what you use in the insert jacks on mixer channels.
I used a HT5 once for a soft rehearsal, nice amp, the reverb is very good BTW but the amp is not very loud and cant compete with drums.  I have a Carvin TS100 which is a modern equivalent of the T100S.  It competes with drums no problem and then some  >:D .  The speaker emulation is fine if you want to record or go into a desk live.  This is basically what the HT5 is designed for.

Recently we started to use my split stacks that had been sitting for a few years and the jacks were dirty and causing issues.

assquatch20:
Here's the top of the power supply board:


And here's the underside:


Seems like the seller was less than forthright. Haven't checked the caps yet but there seems to be continuity from what's been checked so far at least. At this point I feel it is unlikely that the pots of two different channels are equally diminished. Rather I feel this is likely where the issue is, upstream.

You can see where parts have been jumped already. The black stuff came right off with a little pot cleaner but the traces have bubbled up in places. There's also some other added wiring, I think for the fan. I'm starting to wonder if I could recreate this board old school and make it fit. Hopefully won't have to though.

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