09-05-2009 05:05 AM
09-05-2009 05:42 AM
09-05-2009 07:40 AM
09-05-2009 07:51 AM
09-05-2009 08:44 AM
Judging by the gut shots, the phase inverter is indeed SS. If the design is anything like in HT series of pedals (like they claim it is) there's actually quite a lot of solid-state amplification and signal shaping in there. If you ever seen insides of this thing it's pretty evident. There is also a solid-state diode soft clipping gain stage on each channel preceding the tube gain stage(s). Cab sim is a bunch of solid-state active filtering circuits too. etc.
I think they didn't have to use switched mode power supply in this one like they did in the HT pedals. Looks like an ordinary linear supply.
I can make a schematic out of this thing if people can provide me high quality, detailed gut shots of both sides of the PC boards (something from which I can see component values and see the PCB traces) as well as some overall shots of the internal wiring to tube sockets and switches.
Also, if you are swift enough to work on PC-boarded amps you can mod this thing like any other solid-state amp. Modding has never been exclusive to all-tube amps. The mods may not be similar as in tube amps (e.g. change cathody bypass cap) but they are perfectly sensible for anyone familiar with basic OpAmp and analog circuits.
09-30-2009 01:12 PM
09-30-2009 06:28 PM
09-30-2009 09:31 PM
10-02-2009 08:19 AM
10-08-2009 12:13 AM
10-08-2009 04:57 AM
I don't get what those zener diodes are doing. I don't think they're for clipping. Think any of these are for clipping ?
10-01-2010 05:50 PM
Since people don’t seem to have too much interest in this I call it quits now. So, here are unfinished schematics of the HT-5, which should still be helpful for people needing to do some repairs or some other stuff. What are missing are all the rear PC board circuits (jack switching, FX loop amp, loop breaker etc.) and a bunch of component values and designators I simply couldn’t interpret from the few photos I had of the internals. Don’t be too sure to trust that the ones in the schematic are 100% accurate either. These schematics are compiled from gut shot photos just a single person cared to send me and that’s all I could work with. I'm not going to ruin my eyes guessing small details or colour codes out from a pixelated mess.
I now know practically all I wanted to know about this amp and it seems – considering the minimal interest - that due to these diagrams, you will now know as well. Hopefully.
I can consider updating or finishing the schematics if I get pictures that help me do so.
07-13-2013 02:17 PM
hi friends, i need help to find a diagram or schematic (circuits, etc,) of a 50 ht club blackstar head, or similar. i need to fix this amp, and put in a tung sol tubes. if black satr dont suply that schematc what can i do???. i buy in e bay this amp in november or dicember last year. the problem begins with a strange noise and also the am start to get very hot, then one day when a turn on the amp just doesnt do a sound, now when a change tubes the sound was very intermitent no hig volume. i need to fiz this but the only thing i need to find is the diagra, or schematic. i dont know, what can i do here?? im in sonora mexico. where i can fix this think. thanks for your atention friends.
07-13-2013 11:10 PM
If you chose to DIY, start by a good visual inspection. Look for loose connections, connectors that may have popped free, bad solder, burned parts etc.
Check power supply and all fuses..
Take it to a tech.
07-14-2013 09:45 AM
When I had my HT5 head the main mod I wanted to do was keep the speaker signal live while using the emulated output. However, I grew pretty disappointed in the tones so I got rid of the amp.
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