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 Forum: Receivers   Topic: Marantz 4025 Help Needed

Posted: Tue Oct 31, 2017 10:57 am 

Replies: 5
Views: 600


Thanks but wasn't looking where to buy a manual , was simply asking for experienced members for a bit of help !
Similar to something something I would do for others.

Image

 Forum: Receivers   Topic: Marantz 4025 Help Needed

 Post subject: Marantz 4025 Help Needed
Posted: Sun Oct 29, 2017 12:51 pm 

Replies: 5
Views: 600


Currently working on a Marantz 4025 cassette/receiver and unable to find any type of service info on this one ! Hopefully a member has worked on this one and is familair with the offset and bias adjustments/locations As well, the cassette seems to playing a tad slow , again hopefully someone knows w...

 Forum: CAM Lounge   Topic: Impatient Sellers

 Post subject: Re: Impatient Sellers
Posted: Mon Sep 18, 2017 4:44 am 

Replies: 44
Views: 2798


Well, if anyone is uncertain or wants to get a quick learn on frustrated selling, try listing something on Kijiji and then wait for the tirekickers, timewasters, lowballers and useless inquiries from intersted buyers with no idea what you are returning a reply for . They blindly click dozens of ads ...

 Forum: General Audio Discussion   Topic: Unethical Selling Practice

Posted: Sun Aug 06, 2017 9:33 am 

Replies: 36
Views: 2268


What is amazing is when an interested buyer tries to make a lowball offer based on an Ebay listing and neglects to include shipping , duties if any ,etc etc as well as the ever present possibility that the item description was over stated and is crap @! Seller refuses to accept such a wishy/washy co...

 Forum: Amplifiers/Preamplifiers   Topic: Proton AM-455 Need Help with Transformer

Posted: Mon Jul 24, 2017 10:09 am 

Replies: 22
Views: 1313


Teo Audio wrote:
R-core is, IMO, the pinnacle of transformer design for audio equipment. Everything else is inferior. For audio, that is.


So would you suggest leaving the amp at 220v to maintain the integrity and quality factor ?
Played with it again today and really, really good sound with impressive bass control.

 Forum: Amplifiers/Preamplifiers   Topic: Proton AM-455 Need Help with Transformer

Posted: Mon Jul 24, 2017 3:05 am 

Replies: 22
Views: 1313


I measured the original caps and they were within 5 % or less of spec so I reinstalled them just to keep the amp original and to spec The dilemma is whether to swap out the original Billion R core transformer with an substitute or keep the amp "virgin" and live with the 220v issue. Any adv...

 Forum: Amplifiers/Preamplifiers   Topic: Proton AM-455 Need Help with Transformer

Posted: Sun Jul 23, 2017 7:53 am 

Replies: 22
Views: 1313


Well, today was the live or die day for the Proton amp. Spent the evening giving it some thought and really the only way was to start it up on 220-240v and accept what happens afterwards. As good fortune would have it , it started up fine, hum disappeared and the sound quality was pretty darn amazin...

 Forum: Amplifiers/Preamplifiers   Topic: Proton AM-455 Need Help with Transformer

Posted: Sat Jul 22, 2017 4:10 pm 

Replies: 22
Views: 1313


I have a step up until but want to be sure as much as possible before frying the unit. Literally impossible to find anything on this unit. A real shame as it has incredible sound and the build is as good as a NAD ! -- 22 Jul 2017 23:33 -- The amp is using some 2sa 1386A's which are rated up to 160v...

 Forum: Amplifiers/Preamplifiers   Topic: Proton AM-455 Need Help with Transformer

Posted: Sat Jul 22, 2017 2:23 pm 

Replies: 22
Views: 1313


I have a step up until but want to be sure as much as possible before frying the unit. Literally impossible to find anything on this unit. A real shame as it has incredible sound and the build is as good as a NAD !-- 22 Jul 2017 23:33 --The amp is using some 2sa 1386A's which are rated up to 160v My...

 Forum: Amplifiers/Preamplifiers   Topic: Proton AM-455 Need Help with Transformer

Posted: Sat Jul 22, 2017 2:07 pm 

Replies: 22
Views: 1313


Hey Check to see how much AC ripple voltage you have on your DC bus. It could be weak caps on the low voltage regulators beside the large main capacitors too, see what DC voltage you have going in and out of them. A leaky diode in the rectifier bridge can also cause that. Remove them to check the r...

 Forum: Amplifiers/Preamplifiers   Topic: Proton AM-455 Need Help with Transformer

Posted: Sat Jul 22, 2017 1:42 pm 

Replies: 22
Views: 1313


50 volt 4700 caps and reading 20.5 vdc across each of the 4 caps I also would have expected at least 38 to 42 vdc across the caps but just being a bit cautious about trying it at 220v right off I tried raising the caps for one channel to 6000 75vdc audio grade caps but no difference in the hum at al...

 Forum: Amplifiers/Preamplifiers   Topic: Proton AM-455 Need Help with Transformer

Posted: Sat Jul 22, 2017 8:50 am 

Replies: 22
Views: 1313


constant hum is in both channels

 Forum: Amplifiers/Preamplifiers   Topic: Proton AM-455 Need Help with Transformer

Posted: Fri Jul 21, 2017 11:59 am 

Replies: 22
Views: 1313


constant low hum thru speakers , not mechanical. The filter caps check out ok with my cap meter within 5 % Not sure about the line voltage requirements, a bit confusing says 220v 50hz on the back but only 1 line fuse and switching only 1 power line. This is not normal for 220v design DC supply at th...

 Forum: Amplifiers/Preamplifiers   Topic: Proton AM-455 Need Help with Transformer

Posted: Fri Jul 21, 2017 10:32 am 

Replies: 22
Views: 1313


I picked up a Proton AM-455 int amp and the power plug was swapped out to a 120v type Amp rating s on the back state 220v but power switch is switching only 1 lead and there is only 1 ac line fuse. Confusing ! The amp seems to play fine but there is a constant low hum. Caps seems fine , I was wonder...

 Forum: CAM Lounge   Topic: Too Bad there is No LOWBALLER list !

Posted: Wed Jul 12, 2017 6:36 am 

Replies: 6
Views: 643


Just imagine if CAM members were able to create add to a list of lowballers that
have no idea what they are lowballing on or the condition of the equipment .
Most have drifted over from Kijiji after exhausting themselves with all the lowball
pitches !
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