We have used and demo equipment that is just as good as "new" in many cases. Save some cash!

DEMO means that the product has been used as display, demonstrator or reviewer use. These products will carry the same warranty and customer service, where applicable, as factory fresh products. Demos are current or legacy product, but they are always updated with the latest circuitry.

USED means that the product has been previously owned by a party other than Musical Concepts or Musical Design

BLEMISHED (B stock) means absolutely new, but with minor cosmetic defects unless otherwise described. Same as new warranty!

CONSIGNMENT means used and being sold for a 'client' - guaranteed to work upon receipt at your end - typically there is no warranty unless it is expressly offered. This is "as is" purchase.

SPECIAL means we have acquired and built these units and they enjoy a full one year parts and labor warranty. They are new or have been used as a loaner.

Our policy: Vacuum tubes in DEMO, USED or SPECIAL equipment will have a 30-day warranty. These prices are set, in our opinion, very fairly with the assumption that a given item will not be returned for refund. There is a 15-day return period granted except for specific items. If you decide to request a refund there is no refund of shipping charges. If an item is returned damaged or damaged due to poor shipping carton we reserve the right to return the item or come to a settlement with the buyer. CONSIGNMENT items have a seven day return policy, i.e. said item must be posted back to us within seven days of your receiving the item.  


LATEST ITEMS FOR SALE  - Additions Ongoing

Hot off the presses. We have just acquired two Hafler DH-500s with the handsome late model extruded face plates. One has current PA-5 Elite mods/PS-500 power supply. The other one has a bit older PA-3 and older style dual-mono mods. Until I can find time to list them here please call. One with older mods sold and it was traded for a stock amp with original face plate if you want to tell us which mods to install for you.

But wait, we also have a Hafler DH-200 with new hi-current gold binding posts, new PA-4SE  mod and new PS-100 mod installed for $699. Really you can’t believe how fine even our most modest works sound in the current generation.

And more! We have a stock Adcom GFA-545 awaiting mods to fit your requests.



HAFLER DH-220 / PA-3B BOARDS / LC-200 CAPS…………….is a used piece in excellent condition. The PA-3 driver boards are excellent. PA-3s have much of the sound of the PA-4 series boards. LC-200 caps are compact 27,000uF 80 volt parts. They are USA made with that tradition of the old Sprague sound quality, long a reference for high-end makers in the USA. See the IEC power cord socket and the Cardas Copper Binding Posts. It also has a new power switch for years of reliable operation. The mods alone would have been over $700 when they were originally installed. Buy it at $699.


HAFLER DH-200s………………..modified with our PA-4 front-end boards(one has the interim PA-4L/PA-5 boards but is fully a true PA-5 circuit - wow this is good) and PS-200 mod kit. These also have GOLD RCA jacks and GOLD binding posts. The power cord is replaced with an excellent Rhodium plated IEC socket plus provided power cord. These are used amps with all new mods. Each amp is in good cosmetic condition. PA-4 is $499 installed, PS-200 is $359 installed, IEC is $119 installed, Gold binding posts are $69 installed, Gold RCAs are part of PA-4 kit. So as you see if you sent us your Hafler DH-200 for these mods you would pay $1046.

Buy for $1050(PA-4), $1150 PA-4L/PA-5. You are basically paying $0 for a used Hafler DH-200. Not bad.


>>>>>>>>>>I have a close friend who has several items for sale. If you are interested in the following three items then call or email us for more information.<<<<<<<<<<<<<<<<<<<<

For Sale: Dunlavy SC-IV Loudspeakers

These hi-end loudspeakers received a Class A recommendation by Stereophile magazine. They were designed by renowned speaker designer John Dunlavy and built by his company DAL (Dunlavy Audio Labs) in Colorado Springs, Colorado. They're a 3-way design  where the woofers, midranges and tweeter are symetrically arranged to mimic a point source. The midranges and tweeter are then recessed so that the sound from all drivers arrive at your ears simultaneously (called "time-aligned"). Most speakers use the cheap flat mounting board and can't duplicate the imaging of these speakers. They're six-feet tall and weigh 180 pounds (not great for your desktop). Their performance measurements are available on Stereophile.com and are quite astonishing. They work great with either tube or solid-state amplifiers of 25-watts or more. They were $6,000 new but asking only $1800.


>>>>>>>For pickup in owners Denver, Colorado location. Auditioning is available by appointment.<<<<<<<<<<<

Triode(brand name) tubed DAC Model  TRV-DAC1.0SE

A beautiful built DAC with great sound. It uses a pair of 6DJ8/6922 tubes for the output stage. A classic digital converter at $995.

Sorry - the AKG K702 headphones are not included. My friend, not sure he wants to sell them, might consider them an extra coast option if you prefer.


·         Textured aluminum front panel

·         Digital display of input/output sampling rates

·         Digital display of selected digital source (input)

·         Two USB ports, supports up to 24 bits and 192 kHz sample rates

·         Three coaxial inputs, supports up to 24 bits and 192 kHz sample rates

·         TOSLINK optical input supports up to 24 bits and 192 kHz sample rates

·         Front panel and remote control selection of digital inputs (listed above)

·         Front panel and remotely selectable output phase inversion (0° or 180°)

·         Front panel and remotely selectable Asynchronous Sample Rate Converter (upsamples to 24 bits and 192KHz)

·         Front panel and remotely selectable vacuum-tube output buffer

·         Cirrus Logic CS8422 low-jitter digital audio interface receiver

·         Burr Brown PCM1792 high-resolution 24-bit/192kHz D/A Converter

·         High-quality low-pass filter operational amplifier

·         Superior headphone amplifier with front panel volume control.

·         Toroidal power transformer for high efficiency and low leakage flux.

          Metal remote control


This is well covered on many review sites. Check it out. It needs a new belt and vacuum seal gaskets for platter but works fine. The base is medium dark oak. Yours for $1500.

>>>>>>>>>>>>>>>Currently that is the inventory for my friend’s items.<<<<<<<<<<<<<<<<


Sold at $2495 but we may have a similarly outfitted DH-500 soon!!! HAFLER DH-220…………………… is receiving the first PA-5 modification. It is in good cosmetic condition. It is getting the PA-5 Elite Ultra treatment! Be the first with the PA-5 Elite Ultra. Yes, after a lengthy, agonizing effort to improve upon the PA-4 we have improvements in many areas of performance. It is more open, silkier, dynamic and has a “blacker” background among the many exciting refinements. Many will notice the tauter more defined deep bass that belies the sheer majesty of the lower octaves. It benefits from the same luxurious parts complement as our PA-4 Elite Ultra.

It’s the finest version but it’s always important to remember that even the most basic version is a fine sounding amp by the standards of even picky listeners.


This one is SOLD! - But another to come. We now have some PasPro 1/Hafler DH-101 line stage models in stock. HAFLER DH-101 WITH PASPRO 1 INSTALLED……………….. is looking for a home. Our PasPro 1 is a superb sounding tubed mainboard with phono stage and line stage. A similar installation is seen at the link above. This one has a custom input/output board with Gold and Silver RCA jacks(picture soon). It is the standard PasPro 1 version. Standard PasPro 1 is $749 installed. With a bunch of high quality RCAs on the back adding some cost, plus remember it has a phono stage.

We are asking $749 for this demo model.



Sold after extensive upgrades, but we can modify yours or other similar designs.   Custom modified, USB only DAC………..has 24/192 capability with USB 2.0 XMOS asychronous receiver circuitry. This DAC uses the now famous AK4399 DAC, used in some very expensive gear, which has a superbly natural and non-digital quality with great neutrality. The OPA-627 opamps capably handle the output from the DAC circuit. CMC Gold/copper RCA jacks are used too. It sports Elna for Audio 8200uF power supply caps, Silmic and Philips caps too. There are fast glass rectifiers mating with the R-Core power transformer. An XMOS USB windows driver will be supplied. It has native Mac support. This is a very high sound quality for a bargain price of $399.


SOLD but we have a similar models. Demo Musical Design DM-100D Elite amplifier ............. which is black on black and in excellent cosmetic condition is now available. This amp was used at the 2014 RMAF show in Denver. Bonus: it has Mundorf power supply capacitors like the Elite Ultra model. The sound of the DM-100 throughout the years has been beloved by owners. The tradition continues with even more transparent sound than in previous versions. After listening to it you’ll be looking for the tubes, but you won’t find any. It lists at $2495 but you can buy it at $1995 with the full “new” warranty. Just like new but for less! Save $500 and smile.  Link


T-100 Elite Ultra Hybrid amplifier

For the last few years John has been loving his reference T-100 Elite Ultra amp………….it’s spitting image brother is available for you to love.

This hybrid 100W/ch amp sports Jensen 4-pole caps throughout the power supply, Cree SiC rectifiers, Takman resistors and CMC silver binding posts and RCA jacks, Rhodium IEC socket. Many enjoyable nights were provided by this amp. You will love it. Originally $2995, now $2295, link


DSD, XMOS Gustard X10 DAC ………..has 24/192 capability plus DSD support with USB 2.0 XMOS asynchronous receiver circuitry. This DAC uses the now famous ES9018 DACs which have very high clarity, spacious soundstage and a neutral quality. CMC Gold/copper RCA jacks are used too. It sports Nover power supply caps, dual toroid transformers. It has about every conceivable input and output. An XMOS USB windows driver will be supplied, native Mac support. It is unmodified, $399.



Sold!   You’ll agree, a beautiful sounding amplifier at a modest price. This is our standard T-100 amp but gives you a hearty portion of the Elite Ultra sound. It has been used in demo service. Originally $1995, now $1295. Link



Even though this is our standard DM-100D amp it is outfitted with all Nichicon Audio Grade capacitors with all MUSE series caps in the front-end power supply and driver circuitry. Vishay/Dale resistors with their great sound are used. The CRC resistors are 10 Watt wirewound type. The new price is $1995, buy now for $1495. Link


Dynaco PAS-3X tubed preamp with modifications............ including significant revisions featuring a constant-current grounded-cathode 12AU7 line stage and passive RIAA EQ in the 12AX7 equipped phono stage. High quality tubes are included. This is a very different preamp compared to the original unit. The high current line stage has a very low output impedance, wide dynamic range and solid, clear sound. There is an upgraded volume pot for superior smoothness and clarity. A new power transformer supplies the higher required current and the vastly enlarged power supply yields a robust, clean sound quality. Good condition. Your fun times for $595 which will seem a bargain when you check the innards! Now reduced to $495!  90 day warranty  ------------------------This one has been sold but expect a new one here soon. 


Demo / Used Components