Vintage H H Scott LK - 150 HiFi Stereo Vacuum Tube Amplifier, Very 2 X 75 W
Item History & Price
| Reference Number: Avaluer:538244 | Model: LK-150 |
| Type: Power Amplifier | Country/Region of Manufacture: United States |
| Brand: Scott | UPC: Does not apply |
Click on any image toenlarge! Please be patient while they download.(V.11.29.04) © Copyright 2019, by rarestfinds.com) (Item no. 01003)
NOTE: Ebay does no longer allow sellers to include thumbnail picture galleries, in other words, you can not click on the thumbnail pictures below anylonger to download the large images. The only way to provide you the large pictures to see this amplifier as you would look through a magnifying glass, is, to post the pictrues at the end of the listi...ng. Please scroll down and you will see all the large images, or go to my website where I have a working thumbnail picture gallery. Thank you! Rare, and in fine condition, H. H. Scott model LK-150 Stereo HiFi Vacuum Tube Power Amplifier in perfect working order.
Some guy from Vietnam with zero feedback put in a snipe bid in at the very end and pushed it up by $25 and then failed to pay! No bids from outside the US any-longer..... I wish eBay would do something about it! Anyway, here we go again.....
This amplifier is, by many HiFi aficionados, considered the pinnacle of HiFi gear designed by legendary designer H. H. Scott. Sold as a kit, these amplifiers were built by skilled amateurs. This particular one is built nicely with good soldering skills. This particular amp is in very clean condition and all original with the exception of the upgrade of two electrolytic capacitors. To limit current peak demand on the rectifier tubes during low frequency passages, the electrolytic capacitors of the power supply were increased from 30uF to 40uF. The replacement capacitors are, like the original ones, Mallory type FP capacitors.
This amplifier comes with the original Instruction Book (25 pages), the book has some markings inside to check off installed parts while the kit was assembled; three pages instructions how to unpack; a try-fold titled "H.H. Scott takes pride in reprinting this article from THE Atlantic."; folder titled, "SCOTT KIT WARRANTY"; large folded "CHART AM-1", original schematics with service bulletin for Lk-150 STEREO POWER AMPLIFIER printed on the back; and also a part change notice. History:This amplifier is a beast, the incredible frequency range, especially on the low end, has its weight in the form of iron! The transformers are larger than the transformers on an MC -275 or a Citation II! If you are not satisfied with your MC-275 or Citation II, try an LK-150 and you will never look back!An interested party sent me this note:
"Well ... it's okay ... the LK-150 does indeed beat the McIntosh 275, just like you said. Seems the hum reaches -100dB at 0.5mV from -85dB minimum with 65 watts per channel continuous and wide-band F.R. of 10Hz-50KHz +/- 1dB. They get that low hum figure from an aluminum chassis and copper shielded transformer. The LK-150 may well be the best. How about that? :)" Condition:The chassis is straight and to keep it this way, I will ship this in a wooden box made ot 3/4" plywood in case the package is being dropped. All components of this amplifier are original, except some of the tubes which have been replaced. The two electrolytic capacitors in the power supply, named C202 and C203 in the original schematics (included!), have been replaced with NOS Mallory type FP capacitors with two times 40uF instead of the original two times 30uF. The two new capacitors are shown in pictures #20 and #21. Try to find two of these, they are scarce as hens teeth! Both capacitors have been reformed with a DC power-supply and a 1.2 K Ohm resistor to limit the current that is needed to reform the insulation. Each capacitor was reformed over a period of 24 hours and the voltage over the resistor kept below 20 Volt during the entire process. I did the same procedure with the two capacitors in the front which are kept original; on the schematics they are named C201, C202, C205, and C206. Interestingly the can with C201 and C202 has the plus as the common on the can!
One of the capacitor fiber mounting plates was broken and I replaced it with an original Mallory part with the same color. Usually such a repair is done using screws. The original mounting plates were fastened using aluminum rivets. Being a perfectionist, I obtained rivets with the right diameter and used rivets to keep it original (I will include a bunch of spare rivets in case the potential buyer will need some in the future).
The upgrade from 30uF to 40uF is helping with the demand of current at the low end of the frequency spectrum and is limiting peak loads on the rectifier tubes. The pictures show the amp with two Sylvania 5U4 tubes. This amplifier actually was designed for two 5AR4 or GZ34 rectifier tubes. I will include two brand new 5AR4 rectifier tubes as well.
All tubes have been tested on my Hickok TV-7 tube tester (see picture #23) and are at, or above 100%. The two type 7199 tubes are original E.H.Scott tubes and measure:
Pentode system, 58 and 60; a reading of 50 is 100%.Triode system, 42 and 48; a reading of 42 is 100%.
The four 6550 tubes measured 60, 60, 72, and 84; a reading of 45 is 100%.As you can see in the pictures, the chassis is clean, free of corrosion and free of scratches! The pictures show some dust particles as the pictures are magnified as if you would look through a magnifying glass!. There are some slight scratches on the transformers but no dents or any other imperfections. The Aluminum bottom cover is attached with the original screws and they all still have a strong grip and have not been overtightened by some individual who does not know the difference between a wheel log and a screw holding the bottom cover on an amplifier...
In case you noticed that the fuse-cap is not shown in the picture showing the back of the amplifier. I just removed the cap to prevent damage when I put it on its back to take pictures of the underside of the amp. The fuse and fuse cap are original and are included!
Overall, the condition is amazing if you consider the fact that this amplifier is about half a century old! These amplifiers lately sell for about $2, 500. The ones I could find under completed auctions are not as nice and not as original as the one offered here. They also do not have the upgrade with the original Mallory type FP 500 Volt electrolytic capacitors which are impossible to find. This amplifier will sell at any price! If you have questions, text4132454660. Good luck! I have many other interesting items listed on eBay right now. To see myother items on ebay, click here!
Terms andConditions. Please read before you bid!(V.11.29.04)
After the auction:Payment:If you are the successful bidder, your PayPal payment should be received by me within two days.Other payment methods are welcomed. You need to let me know within two days how you will be paying. Payments other than PayPal payments should be received by me within three days, but other arrangements can be made. Please email me with your proposal.Please consider insurance for lost or damaged items, let me know so I can email you an updated invoice. If you do not request insurance, you waive your right to file a claim for lost or damaged items with eBay or PayPal.Items with a final bid over $500 will be mailed requiring a signature unless the buyer is taking responsibility if the item disappears after it was delivered.Massachusetts residents are required to pay 6.25% sales tax unless you provide me with a signed copy of your "Sales Tax Resale Certificate, " (Form ST-4).Non-paying bidders will get a warning after two days unless other arrangements were made. After three days I will initiate the "Unpaid item Process" with eBay. If a "Non-paying Bidder" fails to make payment in full within five days, I will re-list the item. To learn more about eBay's "Unpaid item Policy", click here! Shipping & Handling:Pick-up is encouraged and possible anytime!I only charge actual shipping. There is no charge for handling or packing material.International and domestic Interested buyers can calculate actual shipping cost using the USPS (United States Postal Service) on-line cost-calculator. Just enter the required info and you can calculate the cost to mail the package with this particular item. The weight of this parcel is, lbs. 0 ounces; and the measurements are inches, by inches, by inches.I do not participate in eBay's global shipping program as it is too expensive and too slow. Feedback:I guarantee to reciprocate the courtesy of posting Feedback within ten days upon the successful bidder posting Feedback. E-mail: English and GermanResponse guaranteed if received no later than 24 hours before end of auction. E-mail or text4132454660 me any time, if I am on-line I certainly will be glad to answer any question you may have. Return Policy:I offer an unconditional money-back refund on your purchase price if you are not completely satisfied. Items must be returned in the same package, in the same condition, and by the same shipping service as they where shipped out, within 14 days upon receipt of the items. Please notify me by e-mail before you return your item. If it is my fault, I will pay for shipping both ways. I will not issue a partial refund for any reason, so please do not ask for a partial refund.Bid with confidence. I am a full-time professional antique dealer with 36years of experience. My descriptions and my pictures are never designed tomisrepresent or over-embellish my items. My feedback comments and ratingattest to the quality, level and integrity of my customer service. Myreputation is very important to me.I will try everything reasonable to make you happy! Please sende-mail if not totally satisfied, before leaving negative feedback. If eBayshould be down any time during the last two hours before the end of thisauction, I will disregard all and any bids and declare this auction asvoid. In this case, I would re-list this item as soon as eBay is up andrunning again. Good luck, and happy bidding!!powered by yabeware
NOTE: Ebay does no longer allow sellers to include thumbnail picture galleries, in other words, you can not click on the thumbnail pictures below anylonger to download the large images. The only way to provide you the large pictures to see this amplifier as you would look through a magnifying glass, is, to post the pictrues at the end of the listi...ng. Please scroll down and you will see all the large images, or go to my website where I have a working thumbnail picture gallery. Thank you! Rare, and in fine condition, H. H. Scott model LK-150 Stereo HiFi Vacuum Tube Power Amplifier in perfect working order.
Some guy from Vietnam with zero feedback put in a snipe bid in at the very end and pushed it up by $25 and then failed to pay! No bids from outside the US any-longer..... I wish eBay would do something about it! Anyway, here we go again.....
This amplifier is, by many HiFi aficionados, considered the pinnacle of HiFi gear designed by legendary designer H. H. Scott. Sold as a kit, these amplifiers were built by skilled amateurs. This particular one is built nicely with good soldering skills. This particular amp is in very clean condition and all original with the exception of the upgrade of two electrolytic capacitors. To limit current peak demand on the rectifier tubes during low frequency passages, the electrolytic capacitors of the power supply were increased from 30uF to 40uF. The replacement capacitors are, like the original ones, Mallory type FP capacitors.
This amplifier comes with the original Instruction Book (25 pages), the book has some markings inside to check off installed parts while the kit was assembled; three pages instructions how to unpack; a try-fold titled "H.H. Scott takes pride in reprinting this article from THE Atlantic."; folder titled, "SCOTT KIT WARRANTY"; large folded "CHART AM-1", original schematics with service bulletin for Lk-150 STEREO POWER AMPLIFIER printed on the back; and also a part change notice. History:This amplifier is a beast, the incredible frequency range, especially on the low end, has its weight in the form of iron! The transformers are larger than the transformers on an MC -275 or a Citation II! If you are not satisfied with your MC-275 or Citation II, try an LK-150 and you will never look back!An interested party sent me this note:
"Well ... it's okay ... the LK-150 does indeed beat the McIntosh 275, just like you said. Seems the hum reaches -100dB at 0.5mV from -85dB minimum with 65 watts per channel continuous and wide-band F.R. of 10Hz-50KHz +/- 1dB. They get that low hum figure from an aluminum chassis and copper shielded transformer. The LK-150 may well be the best. How about that? :)" Condition:The chassis is straight and to keep it this way, I will ship this in a wooden box made ot 3/4" plywood in case the package is being dropped. All components of this amplifier are original, except some of the tubes which have been replaced. The two electrolytic capacitors in the power supply, named C202 and C203 in the original schematics (included!), have been replaced with NOS Mallory type FP capacitors with two times 40uF instead of the original two times 30uF. The two new capacitors are shown in pictures #20 and #21. Try to find two of these, they are scarce as hens teeth! Both capacitors have been reformed with a DC power-supply and a 1.2 K Ohm resistor to limit the current that is needed to reform the insulation. Each capacitor was reformed over a period of 24 hours and the voltage over the resistor kept below 20 Volt during the entire process. I did the same procedure with the two capacitors in the front which are kept original; on the schematics they are named C201, C202, C205, and C206. Interestingly the can with C201 and C202 has the plus as the common on the can!
One of the capacitor fiber mounting plates was broken and I replaced it with an original Mallory part with the same color. Usually such a repair is done using screws. The original mounting plates were fastened using aluminum rivets. Being a perfectionist, I obtained rivets with the right diameter and used rivets to keep it original (I will include a bunch of spare rivets in case the potential buyer will need some in the future).
The upgrade from 30uF to 40uF is helping with the demand of current at the low end of the frequency spectrum and is limiting peak loads on the rectifier tubes. The pictures show the amp with two Sylvania 5U4 tubes. This amplifier actually was designed for two 5AR4 or GZ34 rectifier tubes. I will include two brand new 5AR4 rectifier tubes as well.
All tubes have been tested on my Hickok TV-7 tube tester (see picture #23) and are at, or above 100%. The two type 7199 tubes are original E.H.Scott tubes and measure:
Pentode system, 58 and 60; a reading of 50 is 100%.Triode system, 42 and 48; a reading of 42 is 100%.
The four 6550 tubes measured 60, 60, 72, and 84; a reading of 45 is 100%.As you can see in the pictures, the chassis is clean, free of corrosion and free of scratches! The pictures show some dust particles as the pictures are magnified as if you would look through a magnifying glass!. There are some slight scratches on the transformers but no dents or any other imperfections. The Aluminum bottom cover is attached with the original screws and they all still have a strong grip and have not been overtightened by some individual who does not know the difference between a wheel log and a screw holding the bottom cover on an amplifier...
In case you noticed that the fuse-cap is not shown in the picture showing the back of the amplifier. I just removed the cap to prevent damage when I put it on its back to take pictures of the underside of the amp. The fuse and fuse cap are original and are included!
Overall, the condition is amazing if you consider the fact that this amplifier is about half a century old! These amplifiers lately sell for about $2, 500. The ones I could find under completed auctions are not as nice and not as original as the one offered here. They also do not have the upgrade with the original Mallory type FP 500 Volt electrolytic capacitors which are impossible to find. This amplifier will sell at any price! If you have questions, text4132454660. Good luck! I have many other interesting items listed on eBay right now. To see myother items on ebay, click here!
Terms andConditions. Please read before you bid!(V.11.29.04)
After the auction:Payment:If you are the successful bidder, your PayPal payment should be received by me within two days.Other payment methods are welcomed. You need to let me know within two days how you will be paying. Payments other than PayPal payments should be received by me within three days, but other arrangements can be made. Please email me with your proposal.Please consider insurance for lost or damaged items, let me know so I can email you an updated invoice. If you do not request insurance, you waive your right to file a claim for lost or damaged items with eBay or PayPal.Items with a final bid over $500 will be mailed requiring a signature unless the buyer is taking responsibility if the item disappears after it was delivered.Massachusetts residents are required to pay 6.25% sales tax unless you provide me with a signed copy of your "Sales Tax Resale Certificate, " (Form ST-4).Non-paying bidders will get a warning after two days unless other arrangements were made. After three days I will initiate the "Unpaid item Process" with eBay. If a "Non-paying Bidder" fails to make payment in full within five days, I will re-list the item. To learn more about eBay's "Unpaid item Policy", click here! Shipping & Handling:Pick-up is encouraged and possible anytime!I only charge actual shipping. There is no charge for handling or packing material.International and domestic Interested buyers can calculate actual shipping cost using the USPS (United States Postal Service) on-line cost-calculator. Just enter the required info and you can calculate the cost to mail the package with this particular item. The weight of this parcel is, lbs. 0 ounces; and the measurements are inches, by inches, by inches.I do not participate in eBay's global shipping program as it is too expensive and too slow. Feedback:I guarantee to reciprocate the courtesy of posting Feedback within ten days upon the successful bidder posting Feedback. E-mail: English and GermanResponse guaranteed if received no later than 24 hours before end of auction. E-mail or text4132454660 me any time, if I am on-line I certainly will be glad to answer any question you may have. Return Policy:I offer an unconditional money-back refund on your purchase price if you are not completely satisfied. Items must be returned in the same package, in the same condition, and by the same shipping service as they where shipped out, within 14 days upon receipt of the items. Please notify me by e-mail before you return your item. If it is my fault, I will pay for shipping both ways. I will not issue a partial refund for any reason, so please do not ask for a partial refund.Bid with confidence. I am a full-time professional antique dealer with 36years of experience. My descriptions and my pictures are never designed tomisrepresent or over-embellish my items. My feedback comments and ratingattest to the quality, level and integrity of my customer service. Myreputation is very important to me.I will try everything reasonable to make you happy! Please sende-mail if not totally satisfied, before leaving negative feedback. If eBayshould be down any time during the last two hours before the end of thisauction, I will disregard all and any bids and declare this auction asvoid. In this case, I would re-list this item as soon as eBay is up andrunning again. Good luck, and happy bidding!!powered by yabeware
