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MissionAllegroSound has been dedicated to the
accurate recording and reproduction of
acoustic music for well over ¼ Century.
One can't please all the people all the time;
for those who value knowledge & experience,
AllegroSound is here to assist you.
for AllegroBio 
Quid pro quoInfo presented here is extraordinarily labor-intensive;
if you have not purchased from us in the 36 years we've
been in business, your contribution commensurate
with value provided is very much appreciated.
Featuring* AllegroQC™ with 36+ yrs experience.
* Safe-packing. Trust your purchase to
one who knows & cares to pack it right.
World-Wide Shipping
Trade-insTrade-ins are not final until received, inspected, tested
and approved by AllegroSound. Items failing to meet
our minimum standards will be returned at customer's
expense plus a $50 charge for inspection and testing.
If you're not in the market to Buy-Sell-TradeTODAY, bookmark this page & check back later.
* all prices U.S. currency f.o.b. Los Angeles, California USA.
* prices without deposit subject to change without notice.
* AllegroLayAway™ with 20% non-refundable deposit.
* AllegroTradeUP™ with approved trade-in.
Unobtanium Class
w/o market price
FAQs
ConditionSome be 10~60 yrs old with imperfections,
including non-functioning indicator lights.
We do our best to describe known issues,
but, as one man's "good" is another's "poor",
symantics/condition cannot be guaranteed.
NO "mint", "minty", "perfect", "excellent", etc.
All pre-owned/used unless otherwise noted.
See Pics, MainsVoltage, Terms below.
if you need more info.
PicsPics are shown for display purposes
& may not represent exact condition.
Text trumps pics - read description!
if you need more info.
Mains Voltage
& What To Do About It
220~240 Vac
Terms & ConditionsEquipment is carefully Inspected, Cleaned,
Variac'd, Tested for dc-offset & Auditioned
in ref system before it leaves our facility.
Quality work w/TLC takes quality time;
I work at my pace & have orders ahead
of yours; item will ship when testing is
completed and packed for safe transit,
typically within 30 days of cleared funds.
Suitability sole responsibility of Buyer.
All items subject to prior sale or no sale.
Not responsible for errors, typos, etc.
Symantics/condition not guaranteed.
All equipment as-is without warranty.
Add 9.75% Sales Tax within California.
All costs, including, but not limited to,
packing, freight, duty, taxes, fees, etc,
are sole responsibility of Buyer & not
refundable under any circumstances.
All sales final. References on request.
AMPLIFIERS: Tube + HybridSeems like all solid-state amps these days are advertised "tube-like".
And cd's are "Perfect sound forever"... and the spin goes on and on...
The reality is, if you want the sound of tubes, you need tubes.
2-channels, small footprint, BIG sound...
hail the Audio Note Conqueror
Single-Ended Triode stereo amp
c.1997, late Version, low hours,
2-6SN7, 2-300B, 5U4, 8+4 Ω taps.
(or, you could pay 5x more for a
Shindo Cortese without 4Ω taps)
* fyi, if your speakers dip below 8
Ohms, you need a 4 Ohm tap!
Audio Note Conqueror SET a Tim de Paravicini design.
Esoteric Audio Research / E.A.R. / Yashino
869 Enhanced Triode Mode integrated SE
stereo power amplifier, 15w/ch 4-8-16 Ω,
direct amp input, update of fabled 859.
Simply magical on Cabasse Baltics.
E.A.R. 869 ETM integrated SE amp former engineer for Saul Marantz builds a better amp...
fabled Hadley Labs 601
stereo tube amp c.1963,
#61 of only 90 produced,
outperforms Marantz 2-5-8-9,
high-nickel wide-bandwidth
xfmrs, all-original including
Hadley-branded Telefunken,
simply magical on Quad-57
and Infinity ServoStatic 1's.
(or, you could pay more
for a pair of Marantz 9's)
Hadley 601 tube amp fabled Heathkit W-5M wide-bandwidth
vacuum-tube monoblock power amps,
classic Williamson circuit with Peerless
16309 nickel-core transformer fed from
pair of peerless KT66-6L6-5881 beam-tubes,
(a la MC-30 and Red Rose Reference M1),
serviced-upgraded-mod'd by Bob Hovland.
matching WA-P2 preamps available.
Heathkit W-5M monoblocks 
Lector VM-200 hybrid amp,
100w/ch/8 and 150w/ch/4,
14GW8 Input+Driver tube.
mosfet output, low feedbk,
gloss-black side panels.
Lector VM-200 "brid" Switch on-the-fly between SE or PP to match music/spkrs.
fabled Manley SEPP-300B monoblocks
c.1995, switch on-the-fly between
18w Single-Ended & 36w Push-Pull
(switch from SEP for Shirley Horn
to PP for Mahler and Pink Floyd ),
0~10db fdbk in 1db discrete steps
for precise matching to your spkrs.
Sweeet. fyi, EveAnna prefers this
Original Version to the later Retro.
ST in Stereophile: "The SEPP-300Bs
have almost as much delicatessen
and detail as the Jadis SE300Bs,
& they have balls in the bass too, even
in single-ended mode with no feedback."
(or, you could pay 2x more for a
new pr of Cary 300SE Signature's)
Manley SEPP-300B monoblocks All-Original Consecutive-Numbered Matched-Pair !!!
McIntosh MC-30 Type A-116-B
c.1949, 30w/4-16, matched-pr,
Chassis # 08003 & 08004,
Serial # 7E690 & # 7E692,
all original except the tubes,
6L6-1614-5881-KT66 beam-tube
powered for superior sound quality,
5U4-rectified for superior reliability,
Volume controls to bypass preamp
or match other amp in bi-amp setup,
arguably Mac's all-time-best tube amp.
(or, you could pay more for Marantz 2's)
McIntosh MC-30 MP
Balanced update of McIntosh MC-3500/MI-350 by the designer.
fabled Nestorovic Labs tube amps c.1985,
your choice of matched-pairs w/fresh tubes:
* Nestorovic Alpha-1 monoblks #122 / #123,
* Nestorovic NA-1 monoblocks #136 / #137,
balanced update of Mile's legendary design
for Mcintosh Laboratory (MC-3500, MI-350)
producing 150 Watts from inexpensive pair
of 6KD6 beam-tubes, Balanced & SE inputs,
8+4 Ohm Balanced Out, selectable Feedback,
very exclusive, less than 100 pairs produced.
Visually-Physically-Electrically BALANCED!
(or, you could pay 3x more for non-bal MC-3500)
* TAS 3/83: "...all things considered, the more
power in a good tube design, the more concert-hall
realism...& this is true at any given playback level."
Nestorovic Labs tube amps
"...fine detail & presence...power & dynamism...fast & responsive..."
Acoustical Manufacturing Ltd
Quad II-forty monoblocks, 40w,
8+4Ω taps, 2-KT88, 2-6SH7, 5U4.
"...reached deep into the music,
retrieving fine detail and presence...
vocals sound rich and well-textured...
unusual power & dynamism allied with
scale and detail...fast and responsive...
striking presentation of instrumental
timbres..." Audio And Video Lifestyle.
(or, you could pay 6x more for new pair of
Audiopax 88's or 4x more for Quad II-eightys)
Quad II-forty / 2-40 monoblocks Wanna get away...to the concert hall?
Mark Levinson Red Rose Music
Model One Reference Monoblocks,
conceived, designed & manufactured
with excellence entirely in the USA
(no, Martha, these are not made in
China like the solid-state models!),
#04 & #05 c.1998 with updates,
170w Ultra-Linear or 65w Triode,
2-4-6-8Ω taps (high-current 2Ω tap
enable this amp to drive speakers
other tube amps can only dream of),
4-6SN7, 8-6L6/5881, (1-5842/417A),
on-brd mtr, all-Balanced signal path
with NO phase-converter to alter
the acoustic of the recording venue!
(RCA-in adds 5842 phase-converter
for Single-Ended source, if you must),
100-120-240V World Power Supply,
Auto-Standby, factory crates, low hrs,
special Champagne-Gold finish,
ultra exclusive (< 200/prs produced),
outperforms all SETs & everything else!
(or, you could pay 7x more for a new pr
of Lamm ML-3's with 1/5th the power)
* To paraphrase Dr. Strangelove,
"The whole point of a simple circuit
is lost if you make it expensive."
* In the immortal words of Joe E. Brown,
"Well, nothing's perfect."
* In the opinion of AllegroSound,
"These come close; very close."
CLICK for Red Rose Reference
RLM 300B SET amplifier c.2005, 8w/ch, 2-6SN7, 2-300B,
5U4, Magnequest transformers,
Variable-Feedback, hard-wired,
Volume controls, all tubes fused!
small size, BIG sound !
Unison Research SR-1
hybrid integrated amp,
80w/ch/8, 5 line inputs,
upgraded 12AU7 tubes,
mosfet output, remote volume,
outperforms the usual suspect.
(or, you could pay 2x more for a
new Pathos C1 or Ayre AX-7e)
Unison SR-1 amp+pre SETing the bar higher...
Wavelength Signature Series
Duetto SET stereo amplifier
framed in beautiful maple,
8w/ch, 2-6SL7, 2-300B,
5AR4, 8+4 Ohm taps.
(or, you could pay 3x more
for a new Airtight ATM-300)
Wavelength Duetto SET better construction equals better sound.
fabled VAIC VV30B Type-1 Matched-Quartet,
direct 300B swap in amps that can supply
the higher filament current for this super-tube,
excellent in VAC Renaissance, Welborne,
AudioNote, Wavelength and many others.
JC/Stereophile: "My fave 300B by a wide
margin is the beautifully-crafted VAIC
VV30B Type 1...these refined & elegant
tubes are fabricated by hand in the old
Tesla Reserch Labs in Czech Republic...
a plug'n'play 300B equivalent." * also a
fave of Wavelength's Gordon Rankin.
Vaic VV-30B triode tubes seldom equaled, rarely surpassed...
Western Electric 300B
WE300B tubes 
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Los Angeles, California USA
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