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Old 4th February 2019, 07:23 PM   #711
md_Stryker is offline md_Stryker  United States
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PeeCeeBee V4H GB
Hi Shaan,
Please add 2x V4H Rev1 PCBs for me.

Regards,
-Michael
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Old 4th February 2019, 09:18 PM   #712
smartx21 is offline smartx21  Brazil
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Quote:
Originally Posted by shaan View Post
I'm happy to announce that the PeeCeeBee V4H has been updated to Revision 1.
Would you kindly update post #1?
TYVM!
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Max.
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Old 8th February 2019, 02:17 PM   #713
shaan is offline shaan  India
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Quote:
Originally Posted by smartx21 View Post
Would you kindly update post #1?
TYVM!
Post 1 updated.
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Old 8th February 2019, 02:20 PM   #714
shaan is offline shaan  India
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PeeCeeBee V4H Rev1 GB3 List:

CitizenKane - 6 PCBs
delange - 4 PCBs
gusto142 - 2 PCBs
samratsarkar - 2 PCBs
md_Stryker - 2 PCBs
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Old 8th February 2019, 07:16 PM   #715
outtek is offline outtek
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Hi, please add two boardss for me also Shaan.
Thanks.
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Old 9th February 2019, 05:13 AM   #716
gtose is offline gtose  United States
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Join Date: Feb 2009
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PeeCeeBee V4H GB
Default Another V4H is born!

I just completed the wiring and initial tests of my V4H with rev1 mods. Iím not one for words about my listening experiences, but I can say listening for a good portion of the day I did experience toe tapping and goosebumps! Out of the amps Iíve built, the V4H has the most power and the least amount of hum - none, even with my ear to the speaker. Thanks Shaan for sharing your talents and time to bring us this amp!

I have attached some pictures of my final build. Iíll detail below the supporting components for those interested.

- Schaffner FN9244B-10-06, 10A IEC filter, medical grade version
- TE W33 mains switch with built in circuit breaker, tripping at 5A.
- JLE softstart / delay: Amplifier Modules and PCBs For Sale. JLesterP is great to work with and his boards both cheap and great to build! I really like that they run off of their own transformer and not directly off of the mains. The small transformer with 120v primaries is direct from Zettler Home Page | ZETTLER MAGNETICS, INC..
- Dual mono Antek AS-3440 (AS-3440 - 300VA 40V Transformer - AnTek Products Corp) with their expensive - but very nice - steel transformer covers (CA-300 Steel Cover - AnTek Products Corp)
- Dual mono CRC PSUs from Prasi / Project16: CRC Power Supply (Class A amplifier). Secondary snubber measured using the Quasimodo. 2x UCC 63v/33000uF caps (https://www.mouser.com/ProductDetail...MH630T333MB80T) per channel per rail. CRC resistor is 0.5R, 10w Ohmite (https://www.digikey.com/product-deta...50E-ND/1124926). I need to replace the bleeder resistors as they run super hot. I forgot to recalculate them after moving to 56v rails and they are bleeding off 3.5w currently (1K0). Even though they are rated for 5w, I may bump them to 3K3 to lower the dissipation and heat.
- All of the rails run through fuses mounted on the rear panel. Currently fitted with 5A fast blow fuses and havenít had any issues, except for when I shorted the speaker output and one of the fuses blew =) I need to measure the actual rail current under load and maybe fit in a smaller (4A?) slow blow fuse.
- V4Hs with the Rev1 mod, fitted with Exicons and CDE silver mica in place of ceramics. PRP 1/4w and 1w resistors from www.soniccraft.com, Noble metal plate power resistors from eBay (https://www.ebay.com/itm/152908729458). Q1,2 and Q9,10 matched.
- The hot stuff is mounted to a piece of 1/4Ē aluminum angle and then bolted to the heatsinks making up the side of the chassis. For the Exicons I used Wakefield CD-02-05 thermal pads (https://www.digikey.com/product-deta...545-ND/7070009).
- Dual mono speaker protect board also from JLE. Powered by the extra 15vac secondaries on the transformer.
- Binding posts are Propeller Posts from Madisound (https://www.madisoundspeakerstore.co...ing-post-pair/). Great build quality and mounting compared to my typical Chinese posts, but not crazy $$$ like Mundorf or others.
- RCAs are CMC 816-WU from gd-parts on eBay, connected with twisted pair 22awg and terminated using TE MTA 100.
- About 1,000 quick disconnect tabs and connectors =)

Phew.

The following is the detail of my ground scheme. This is always the hardest thing for me during builds, but the V4H was very straightforward and I think the dual mono PSU really helped make this cleaner. The guide that I used for this build was ESPís http://sound.whsites.net/earthing.htm.
- Transformer static shields connected to chassis close to transformer
- IEC ground bolted to rear panel chassis using the mounting method described on ESP
- A ground loop breaker per channel as described by Figure 4 on ESPís grounding article. The earth connection is connected to the same chassis ground bolt as the IEC.
- Each channel with the following connected directly to PSU star ground: Speaker return binding post, ground loop breaker, speaker protection ground, V4H ground (SGND and PGND tied together at PGND). Luckily the PSU had exactly 4 ground tabs!

Next up is to finish designing a front panel and handles for this beefy chassis. For what its worth, this chassis is definitely overkill and doesnít even get close to warm. But, if nothing else, the size allowed me to get the transformers as far away from the signals as possible.
Attached Images
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File Type: jpeg IMG_3233.jpeg (650.1 KB, 321 views)
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Old 9th February 2019, 05:43 AM   #717
shaan is offline shaan  India
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Hats off to the cleanliness of your assembly gtose! Nice set of speakers too.

Thanks for the kind words. Happy to know you like the v4h's sonics
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Old 9th February 2019, 06:11 AM   #718
Hicoco is online now Hicoco  France
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PeeCeeBee V4H GB
gtose, Nice work, i like your enclosure...where did you get it ? thank
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Old 9th February 2019, 11:00 AM   #719
Vunce is offline Vunce  United States
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PeeCeeBee V4H GB
Fantastic build G!!
Your metal work is superb as usual, very neatly packaged together. Iím sure your going to enjoy this fine amplifier that Shaan shared with us
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Old 9th February 2019, 11:45 AM   #720
gaborbela is offline gaborbela  Canada
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Very nice build, congratulation.
Next week I will receive my 100R resistors (replacements for the 200R and 300R) I can finish the PCB stuffing all the way. I can start testing.
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