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Greater Toronto Area DIY meetup
Greater Toronto Area DIY meetup
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Old 19th June 2019, 02:27 AM   #1141
BigE is offline BigE  Canada
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I am desperately trying to finish off my amp for the event. I am rewiring it, and hope that I don't insert a bad noise. I think it should be fine. Last I measured, it was very quiet -- at least in the 60/120 Hz department.

Let's hope I don't mess it up.

Bloody thing weighs a ton. It's an F5T with a monster transformer, about 95 watts RMS per channel into 8 ohms......all in a single enclosure. Made with IRF 240 and 9240 outputs.

I might not be able to get the snubbers back on before the event. If I do, it'll be temporary. Hoping that I've made it a bit more sensible...at least maintenance wise.... at the expense of a lot of contacts.

Last edited by BigE; 19th June 2019 at 02:45 AM.
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Old 19th June 2019, 02:58 AM   #1142
ticknpop is offline ticknpop  Canada
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Join Date: May 2005
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Greater Toronto Area DIY meetup
Yes 2 pole Speakon at the speaker end.
The shop speakers are 40 year old JBL home built 4 way - 100db/1 watt - loosely based on the 4350 studio monitor with larger woofers and mid horn
the other end is bare wire, spades, and bananas all on plug in adapters so it will plug into most amps brought in quickly


Re F5 T we have a special hand fork that raises to about 30 inches, load it onto that from the trunk and it wheels right in to the listening room and connect it without having it to be unloaded from the hand fork

Last edited by ticknpop; 19th June 2019 at 03:02 AM.
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Old 19th June 2019, 03:34 AM   #1143
BigE is offline BigE  Canada
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I really hope to have it ready.
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Old 20th June 2019, 02:13 PM   #1144
rsavas is offline rsavas  Canada
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Hi Dave,
Quote:
I was trying to finish Bob Cordell’s new lateral FET power amp for Hafler rebuilds but am too busy with work this week to test it yet in the Perreaux chassis I have (might be about 450 w channel 8 ohms ) its about 90% done, will have it for the fall meet.
To bad you have run out of time, while I am there, I can help you out, let me know what you need, so I can bring it along with me if it helps you move along to completion.
Rick
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Old 20th June 2019, 09:04 PM   #1145
ticknpop is offline ticknpop  Canada
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Join Date: May 2005
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Greater Toronto Area DIY meetup
TEAC Dolby B and C cassette deck , maybe 50 hours on it. Was rebuilt with new low noise opamp, metal film resistors, Wima capacitors, Panasonic electrolytics Was about $350 when new
$25

1 of. NHT 1259 — 12 inch woofer. $25
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Old 20th June 2019, 09:12 PM   #1146
ticknpop is offline ticknpop  Canada
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Rick,

The amp is at home and I have too much to move for food and other electronics for the meet to bring. I can send some pics. Amp chassis has standoffs added to mount the new driver boards, power supply rebuild finished, just need to match the jfets and mount the boards, output zobel is mounted on the original Perreaux board (its higher power handling).
Then test it with 1 and then 3 output pairs.

Did you change gate resistors or use the 221/475 as the Profusions double die devices are double the capactance of the DH 200 Hitachis.

Last edited by ticknpop; 20th June 2019 at 09:18 PM.
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Old 20th June 2019, 09:39 PM   #1147
rsavas is offline rsavas  Canada
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That's fine Dave, it must be a slug to move, bring your pics along and we can discuss your build.
Not sure if you read, when I did asked Bob C. to comment about the requirement for matching complementary jfets for Idss in this design case.
Hafler DH-200/220 Mods

Last edited by rsavas; 20th June 2019 at 09:46 PM.
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Old 20th June 2019, 11:00 PM   #1148
Lo_Tse is offline Lo_Tse  Canada
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Quote:
Originally Posted by ticknpop View Post
TEAC Dolby B and C cassette deck , maybe 50 hours on it. Was rebuilt with new low noise opamp, metal film resistors, Wima capacitors, Panasonic electrolytics Was about $350 when new
$25

1 of. NHT 1259 12 inch woofer. $25
You still have cassette deck,😄😄
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Old 20th June 2019, 11:04 PM   #1149
ticknpop is offline ticknpop  Canada
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Lo TSe For $25 you can say that too
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Old 20th June 2019, 11:13 PM   #1150
Bigun is offline Bigun  Canada
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Greater Toronto Area DIY meetup
cassettes! wow, maybe somebody can bring some ABBA
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"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
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