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Old 2nd September 2013, 02:55 PM   #1
dhenryp is online now dhenryp  United States
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Default How much did you spend on your DIY Pass amp?

Looking at the pictures thread, it looks like there is a wide variety of amount spent on DIY Pass amps. If it's not to cheeky, I would like to hear from you folks to see how much you spent.

Ill start out with what I've spent on the parts for the dual F5T builds (one V2 and one V3) that I'm in the middle of. I have all the parts for both and I'm half way through the actual build of the V2.

F5T V2 ~$375
F5T V3 ~$525
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Old 2nd September 2013, 04:01 PM   #2
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Originally Posted by dhenryp View Post
Looking at the pictures thread, it looks like there is a wide variety of amount spent on DIY Pass amps. If it's not to cheeky, I would like to hear from you folks to see how much you spent.

Ill start out with what I've spent on the parts for the dual F5T builds (one V2 and one V3) that I'm in the middle of. I have all the parts for both and I'm half way through the actual build of the V2.

F5T V2 ~$375
F5T V3 ~$525
You are doing great! My store chassis for V2 cost more than 375.00!

I did much better on F-5, where I built the chassis with M&M sinks...they are considerably more robust than what the stores chassis sets include....This chassis is borderline under spec for Turbo versions, whether stereo V-2 or V-3 mono. It can be done and has, but this project needs more to make me feel good about it. If I had to do it over, I would have built My own. Good luck with your build, I am shelving mine and going back to work finishing Pearl 2 and another 1/2 built F-5 (regular, not turbo) I need to finish. Hopefully the smoke will clear enough for me to build confidently with what I have for Turbo V-2, otherwise its getting either built into a 2 pair F-5 cascode Using the F-5c boards which I have on hand, or Aleph J that I'm in on through 6L6.

Russellc
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Old 2nd September 2013, 08:47 PM   #3
dhenryp is online now dhenryp  United States
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Russellc - I'm cheap and I don't think either of my amps will be mistaken for store bought. The amps are going in a home theater so I'm shooting for looking (and sounding) good in the dark! The basic chassis are wood with some metal trim parts and panels. Most of the electronic pieces are new from Mouser. I'm using eBay used heat sinks and surplus NOS transformers and PS caps.
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Old 2nd September 2013, 08:52 PM   #4
Ryssen is offline Ryssen  Sweden
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I´ve maid 3 Pass amps (F3,F5,F6) and I never counted how much I spent.
Maybe thats best...hihi
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Old 2nd September 2013, 10:56 PM   #5
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I built the F5 using Conrad heatsinks, Antek 400 VA transformer, added PSU stages, heatsink temp LED alarms, speaker protection and clipping (Class A going into AB) LED monitors. Cost for all that was about $600 (US).

I did my own chassis fabrication, to include the heavy aluminum base and rear apron. The front panel work was done by Front Panel Express, and I did the acrylic top plate, and African hardwood sides. I got my two Weston VU meters for about $60 (US) some 30+ years ago; these meters are extremely rare pieces and if you can find them today, they go for about $400 each.

My other hobby is designing and fabricating race cars. I've NEVER attempted to add up the cost for any single car I've built--I doubt if I can stand the stress and agnst of that answer.....!
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Old 3rd September 2013, 05:52 AM   #6
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by dhenryp View Post
How much did you spend on your DIY Pass amp?
everything .........

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Old 3rd September 2013, 02:26 PM   #7
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CanAm,

Do your end plates impact the thermal efficiency of the sinks of your F5? Doing mental gymnastics I can make arguments to myself that they would both increase the airflow by making a more efficient chimney and block some cold air access. Curious what impact if any other than looking good?
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Old 3rd September 2013, 03:00 PM   #8
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CanAm,

Do your end plates impact the thermal efficiency of the sinks of your F5?
Bob, I have two low-flow, low-noise muffin fans on the rear apron of my amp. They effectively "pressurize" the internal plenum of the amp (flowing air around the transformer, electrolytics, power resistors, etc). From there, I have machined channels at the base of the Conrad heatsinks to allow the chassis air to exit, and flow upwards between the heatsink fins and the wooden side panels. The resultant forced-airflow keeps the amp running very cool--and one of these days I'll probably crank up the bias in search of "sweeter spots" on the MOSFET curves. (I recall "This is Spinal Tap"....MY amp goes to 11.....!!)
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Old 3rd September 2013, 03:28 PM   #9
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Ahh - I noticed the lighted fans but didn't realize you were helping your main sinks along. Nice.
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Old 3rd September 2013, 03:43 PM   #10
6L6 is offline 6L6  United States
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CanAm Man's amp ( say that three times fast...) has sufficient airflow and proper thermal protection that I would not hesitate putting a F5T or many-output BA- into that chassis.

And those VU meters are soooo cool its beyond amazing.
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