Tapeheads Forums


Go Back   Tapeheads Forums > General Audio Discussions > Receivers, Amps, and Preamps - Solid-State

Receivers, Amps, and Preamps - Solid-State The heart of every system. Discuss your amps, receivers and control amplifiers here.

Universal Capstan Motor
Reply
 
Thread Tools Display Modes
  #1  
Old 05-28-2011, 09:08 PM
bwana5_2009 bwana5_2009 is offline
TapeHeads.Net Member
 
Join Date: Dec 2010
Location: Australia
Posts: 22
120v to 240v - any alternatives to a step down transformer?

Hi,
I've been offered a US-spec receiver, but as I live in Austraila, I'd need to overcome the differences in voltage. I'm aware I could look at getting a step-down transformer, but was also wondering about the possibility of having an electrician replace the transformer inside the receiver. Not sure if this is even possible - can anyone let me know?

Thanks
Liam
Reply With Quote
  #2  
Old 05-28-2011, 09:21 PM
Pacific Stereo's Avatar
Pacific Stereo Pacific Stereo is offline
Yeah? Well, MINE goes to 11!
 
Join Date: Feb 2010
Location: Somewhere in paradise!
Posts: 6,960
This is a real problem, as it will be almost impossible to find the correct transformer. You'd need to find a donor unit that natively runs on 240 volts, or a general export model with a multi-voltage transformer in it.

There's nothing inherently wrong with a step-up transformer, it just that you will have to get one large enough to supply the current requirements. This isn't a problem with doo-doo draws like CD players or cassette decks, but is a problem with amplifiers.

Look on the back of the unit for the power drawn in watts. That will be the maximum consumption of the unit. You'll have to buy a step-up transformer at least that big.
__________________
pacificstereo.net "We're easy."



I RESTORE VINTAGE AUDIO AND VIDEO GEAR. Master technician for Pioneer, Sony, Marantz, Concept. Endorsed by Richard Schram for Concept product restoration. Worked for both Yamaha and JVC. Sonics consultant for Denon. Pacific service manager, Central Service lead tech, liquidator at our demise. Infinity IRS dealer. Authorized servicer for virtually every brand on the planet at one time or another. Music addict. Mastering & recording engineer, weaned on a Neve (no other console sounds like a Neve!). Industry-respected ears. Head Tapehead.

Need vintage audio & video repair and restoration, or unobtanium semiconductors and parts? Ask me! And do visit the website: pacificstereo.net
Reply With Quote
  #3  
Old 05-28-2011, 10:02 PM
Pentium100's Avatar
Pentium100 Pentium100 is offline
Serious Tapehead
 
Join Date: May 2009
Location: Kaunas, Lithuania
Posts: 2,279
I can get a 800W transformer for ~60EUR in my local electronics store (where I buy capacitors, transistors etc). They should be available in your electronics store too. A 300W transformer costs 32EUR.
__________________
R2R: Akai GX636, Электроника-004, Revox A77, Юпитер МК-106С, Снежеть-301, National RQ-115, Uher 4400 IC, Aidas 9M, АСТРА 110С - Cassette: Technics RS-BX646, Sony WM-D6C, Marantz PMD430, Sony WM-EX606 - VHS: Siemens FM739 (SVHS), Sharp VC-MH704, Panasonic AG-7330 (SVHS) - Radio: Latvija M, Leak Troughline Stereo, Siemens B8 - Record player: Technics SL-D20, JVC L-E5 - LD: Pioneer CLD-2850 - MD: Sony MZ-RH1 - Amp: Denon PMA-1080R, Hitachi HA-37 - Other: dbx 224, 400xg, 3bx-ds 500char limit is here
Reply With Quote
  #4  
Old 05-29-2011, 03:15 AM
DuckTape's Avatar
DuckTape DuckTape is offline
Type IV FTW
 
Join Date: May 2011
Location: Texas! Yee Haw!
Posts: 760
I just bought a small step up xfmr for $20 for my KE600S, LOT of websites in the US and all the product is coming out of china for this mkt anyway, I would think they same would be true for you.

http://www.220-electronics.com/Trans...-converter.htm

I got the DS-100, but it's adjustable for incoming and outgoing voltage and they have tons of adapters, so it would be great for you, dunno about s/h tho, that may crush you *edit* ==>> were you to order from this website, which I doubt would be needed, just providing the link to give an idea of what I'm talking about

isnt it cute?


Last edited by DuckTape; 05-29-2011 at 03:24 AM. Reason: pic
Reply With Quote
  #5  
Old 05-29-2011, 08:53 PM
TerryLeBoombox's Avatar
TerryLeBoombox TerryLeBoombox is offline
Serious Boombox Head
 
Join Date: May 2010
Location: Brisbane Australia
Posts: 628
Hi Liam,

I have a range of Japanese gear I bought on yahoo.auctions.jp, and I purchased my stepdown from Tortech. They are in Sydney.

http://www.tortech.com.au/

Jaycar usually keep 120 volt (American) stepdowns in stock, but they don't keep Japanese voltage ones.

I'm pretty sure it would be a hassle finding the right replacement for an internal changeover. It's no extra drama using a stepdown.

Terry.



Quote:
Originally Posted by bwana5_2009 View Post
Hi,
I've been offered a US-spec receiver, but as I live in Austraila, I'd need to overcome the differences in voltage. I'm aware I could look at getting a step-down transformer, but was also wondering about the possibility of having an electrician replace the transformer inside the receiver. Not sure if this is even possible - can anyone let me know?

Thanks
Liam
Reply With Quote
  #6  
Old 05-30-2011, 03:34 PM
bwana5_2009 bwana5_2009 is offline
TapeHeads.Net Member
 
Join Date: Dec 2010
Location: Australia
Posts: 22
Thanks everyone for the advice. I've had a brief look into the options for a step-down transformer, and there seems to be a large variance in the price. For a 1000w model (what my system woud need), ebay have them for about $80 with free delivery, local electronics store (jaycar) have them for $360, and the guy I use to work on my audio gear gave me a price of $250.

Is there actually any difference (aside from the price) between these?

Thanks,
Liam
Reply With Quote
  #7  
Old 05-30-2011, 06:29 PM
Pentium100's Avatar
Pentium100 Pentium100 is offline
Serious Tapehead
 
Join Date: May 2009
Location: Kaunas, Lithuania
Posts: 2,279
Well, without the actual models here is no way to tell. Maybe they all are selling the same device?
__________________
R2R: Akai GX636, Электроника-004, Revox A77, Юпитер МК-106С, Снежеть-301, National RQ-115, Uher 4400 IC, Aidas 9M, АСТРА 110С - Cassette: Technics RS-BX646, Sony WM-D6C, Marantz PMD430, Sony WM-EX606 - VHS: Siemens FM739 (SVHS), Sharp VC-MH704, Panasonic AG-7330 (SVHS) - Radio: Latvija M, Leak Troughline Stereo, Siemens B8 - Record player: Technics SL-D20, JVC L-E5 - LD: Pioneer CLD-2850 - MD: Sony MZ-RH1 - Amp: Denon PMA-1080R, Hitachi HA-37 - Other: dbx 224, 400xg, 3bx-ds 500char limit is here
Reply With Quote
  #8  
Old 05-30-2011, 09:25 PM
390FE's Avatar
390FE 390FE is offline
Serious Tapehead
 
Join Date: Jan 2009
Location: Western NY
Posts: 1,359
Quote:
Originally Posted by bwana5_2009 View Post
Hi,
I've been offered a US-spec receiver, but as I live in Austraila, I'd need to overcome the differences in voltage. I'm aware I could look at getting a step-down transformer, but was also wondering about the possibility of having an electrician replace the transformer inside the receiver. Not sure if this is even possible - can anyone let me know?

Thanks
Liam
Here is the thing (as Pacific brought up) you would first have to find out IF that make & model receiver was offered in Austraila or Europe as a 220V / 240V version. Then you would have to find the Austrailan or European 220V / 240V Service Manual which would list the original 220V / 240V transformer part #.
Then have a qualified tech properly modify the receiver as it is NOT just a simple transformer swap. They will also need to make some component & wireing safety changes as needed. Also that transformer may no longer be available due to age.

You are better off using a step up / step down transformer like suggested. As it would cost you a lot less this way.

Now a 120V to 220V step up transformer is the same as a 220V to 120V step down transformer. All depends on how it is hooked up.

You are better off getting a larger wattage step down transformer then you need as that will give you extra for turn on surges & if you decide to add more 120V gear later.

Now a little electronics info for you. As you "step down" the voltage using a transformer your available current goes up (depending on what wattage the transformer is designed for.).

If you "step up" a voltage with a transformer your available current goes down.

I found a few reasonably priced step down / step up transformers on E-Bay a couple months back.

Make sure the transformer is at least fuse protected on the output so if you have a problem with the receiver it doesn't fry the step down transformer. It wouldn't hurt having both the input & output of the transformer fused.
Reply With Quote
  #9  
Old 05-31-2011, 01:43 AM
bwana5_2009 bwana5_2009 is offline
TapeHeads.Net Member
 
Join Date: Dec 2010
Location: Australia
Posts: 22
Hi everyone. Thanks for your replies. I figure that I'd need a 1000w step down transformer - the receiver is rated at 600w. The receiver is rated at 120v - but most of the step down transformers seem to go from 240v to 110v - I'm assuming this isn't too much of an issue???

The step down transformer I found on ebay for $80-odd is:
http://cgi.ebay.com.au/ws/eBayISAPI....ht_4749wt_1145

The one from local electronics store for $369:
http://www.jaycar.com.au/productView...r&form=KEYWORD

The third for $250 was a verbal quote from an electrician I've used to repair some other audio equipment I have. Would be useful if anyone could tell me if there's any issues with the one on ebay (there were a few at this price) - this seems likely to be the cheapest solution - but don't want it to cause problems down the track.

I do have the service manual, and the receiver was sold in Australia - but was quite a while back. I have doubts the parts are still readily available, but I guess it wouldn't hurt to find out the $$ - particularly if I need to spend a few hundred on a step-down transformer...

Last edited by bwana5_2009; 05-31-2011 at 01:47 AM.
Reply With Quote
  #10  
Old 06-26-2011, 12:15 AM
laatsch55's Avatar
laatsch55 laatsch55 is offline
There Are Trees In Wyo!!!
 
Join Date: May 2010
Location: Gillette, Wyoming
Posts: 738
Didn't notice this was a month old
__________________
"It's a small world , but I'd hate to have to paint it" Steven Wright

Last edited by laatsch55; 06-26-2011 at 12:35 AM.
Reply With Quote
  #11  
Old 07-09-2011, 10:45 PM
EM-X90 EM-X90 is offline
Banned
 
Join Date: Jan 2011
Posts: 165
Quote:
Originally Posted by laatsch55 View Post
Didn't notice this was a month old
Wish my state had the lowest liquor taxes):
Reply With Quote
  #12  
Old 07-09-2011, 10:49 PM
laatsch55's Avatar
laatsch55 laatsch55 is offline
There Are Trees In Wyo!!!
 
Join Date: May 2010
Location: Gillette, Wyoming
Posts: 738
A damn shame ain't it??
__________________
"It's a small world , but I'd hate to have to paint it" Steven Wright
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Any good alternatives box wise for 10.5 reels Wayne C Reel To Reel 25 02-06-2011 12:02 AM
Alternatives to TDK AD Tapes? Tapemystic Blank Cassette Tape 7 10-26-2009 06:32 PM
Converting 120V to 230V sound reproduction unaffected? tapedeck Cassette 2 09-18-2009 12:25 AM
Step down transformer from 230V to 110v baguadao Help and Do It Yourself 3 09-07-2009 04:35 AM
XK-S7000: 100V to 120V conversion possible? reeltorock Aiwa 5 06-20-2009 02:11 PM



For more Tapeheads affiliates and links, see the Links and Resources page.
Would you like to see your company or site here?  CONTACT US


All times are GMT -7. The time now is 11:12 AM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright 2013, Tapeheads.Net. All rights reserved, no use of any element incorporated into this site without express written permission.