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Old 21st June 2013, 07:31 AM   #111
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The chasis is too big for the low TIM. You can make a smaller chasis for low TIM and install your superamp in this chasis. Will put this chasis to correct use at a little extra work.

Not comfortable, then leave it for its resident amp.

Gajanan Phadte
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Old 21st June 2013, 08:09 AM   #112
amptech is offline amptech  Scotland
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22,000uf per rail is fine, I use 15000uf per rail on my 300 per channel amp with 70v rails with very good performance plus 6k8 and 220nf caps across them to drain after powering down the amplifier. I would recommend adding speaker fail safe circuitry is case faults happen and cook your speakers...
These type of circuits can be brought on line or if you want to make your own using small transformer even tap it off the amps psu.
My own amp has many fail protection circuits such as soft start/system ready/dc detection with 2 relays latching each channel plus clip display and thermal shut down...All seems over kill but amp is in local studio and I've seen first hand how gear is used by swapping speaker cabs when amps are powered up!

Regards A.
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Old 21st June 2013, 02:43 PM   #113
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Quote:
Originally Posted by gmphadte View Post
The chasis is too big for the low TIM. You can make a smaller chasis for low TIM and install your superamp in this chasis. Will put this chasis to correct use at a little extra work.

Not comfortable, then leave it for its resident amp.

Gajanan Phadte
The Low TIM that I built is done with Jan's PCB's which are quite large. Not that much of the case is unused.
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Those heatsinks were originally planned for the Superamp. I actually had the output channels mounted to them. When I couldn't get it working, I used them for the Low TIM. I have another pair just like them that I plan to use for the Superamp now. That is why I said it will probably end up looking like the Low TIM.

Quote:
22,000uf per rail is fine, I use 15000uf per rail on my 300 per channel amp with 70v rails with very good performance plus 6k8 and 220nf caps across them to drain after powering down the amplifier. I would recommend adding speaker fail safe circuitry is case faults happen and cook your speakers...
These type of circuits can be brought on line or if you want to make your own using small transformer even tap it off the amps psu.
My own amp has many fail protection circuits such as soft start/system ready/dc detection with 2 relays latching each channel plus clip display and thermal shut down...All seems over kill but amp is in local studio and I've seen first hand how gear is used by swapping speaker cabs when amps are powered up!

Regards A.
I'm not sure how ambitious I will get with extra circuitry. I guess it will depend on how much I like the sound and what it gets used for. I have quite a stack of amps already.
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Old 21st June 2013, 06:28 PM   #114
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There's almost no such thing as too large a heatsink, especially when it avoids the use of a fan. Rock on! I say...
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Old 21st June 2013, 07:16 PM   #115
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When I first got in to DIY I was constantly searching Ebay for heatsinks because it seemed like all of the amps guys were raving about were Class A. The first amp I built was the P101 and I bought new heatsinks and they were very expensive. I bought used after that. I still have quite a few including some tunnels that are drilled for T-03's.

Andrew,

I am using On Semi MJ15003 and MJ15004. What would you say it the best starting bias for them? What voltage drop should I be looking for over the .33ohm emitter resistors?

Thanks, Terry
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Old 22nd June 2013, 07:16 AM   #116
AndrewT is offline AndrewT  Scotland
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optimal ClassAB bias
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regards Andrew T.
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Old 22nd June 2013, 09:24 AM   #117
Zero D is offline Zero D  United Kingdom
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@ still4given

Hi, i'm using MJ15003 and MJ15004 in a modified Crimson Elektrik amp. Nice beefy transistors, & i only had to change them in one channel, plus drivers, once in over 30 years !

All the best with it
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Old 23rd June 2013, 03:23 AM   #118
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optimal ClassAB bias
Which is?
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Old 23rd June 2013, 03:32 AM   #119
AJT is offline AJT  Philippines
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NP has a lot of inputs here: "Optimum" Class B better than Class AB?

workhorse thread: low-biasing or high biasing in Class-AB amps

streten's : Class AB is being mismaligned ?
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Old 23rd June 2013, 04:18 AM   #120
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Ha, now it is as clear as mud. As usual, ask ten engineers a question and get ten different answers.
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