EHRHORN PA-77 Manuel utilisateur

INSTRUCTION AND TECHNICAL MANUAL

IDODEL PA-77 LINEAR POWER AMPLIFIER

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EHRHORN TECHNOLOGICAL OPERATIONS, INC.

BROOKSVILLE, FLORIDA 3351

November 1, 197

i

TABLE OF CONTENTS

TABLE OF CONTENTS.......................................................................... i

STANDARD WARRANTY.......................................................................... i i

SECTION 1 - GENERAL DESCRIPTION AND SPECIFICATIONS. . 1

SECTION - INSTALLATION .........................................................

REAR PANEL INTERCONNECTIONS

..........................

4

SECTION 3 - OPERATION .................................................................. 5

CONTROL FUNCTIONS

................................................ 5

TUNE-UP PROCEDURE ................................................ 6

FINAL OPERATIONAL ADJUSTMENTS, M ON I TOR ING B

PROTECTIVE DEVICES, OPERATING PRECAUTIONS 9

SECTION 4 - MAINTENANCE AND TROUBLESHOOTING..................1

SECTION 5 - THEORY OF OPERATION............................................14

SECTION 6 - ILLUSTRATION S.........................................................19

TOP V IE W ....................................................................19

BOTTOM V IE W ............................................................. 0

REMOVAL OF POWER S U P PL Y

...................................

1

CIRCUIT DIAGRAM (SCH EM A TIC)

..........................

EHRHORN TECHNOLOGICAL OPERATIONS, INC.

i i

STANDARD WARRANTY

EHRHORN TECHNOLOGICAL OPERATIONS, INC. (ETO) marrants each nan

product manufactured by it to be fre e from d e fe ctive m a terial or

morkmanship and agrees to remedy any such defect or to fu rn ish a

nem part in exchange fo r any part of any u n it of it s manufacture

which under normal in s ta lla tio n , use, and service d isclo ses such

d e fe ct, provided the unit is d e live red by the omner to us or to

our authorized dealer or d is trib u to r from mhom purchased, in ta c t,

fo r our exam ination, roith a l l tran sp o rtatio n charges prepaid,

u/ithin ninety davs from the date of sale to o rig in a l purchaser,

provided that (1 ) such exam ination d isclo ses in our judgment that

i t is thus d efe ctive and that ( ) a prop erly completed m arranty

re g is tra tio n form has been m ailed to ETO m ithin fiv e (5 ) days

a fte r date of sale to o rig in a l purchaser.

NOTEi Do not under any circum stances ratu rn equipment to ETO

m ithout rece ivin g e x p lic it au th o riz atio n fo r such

retu rn from us in advance. Shipment of equipment in

other than approved fa cto ry packing may void th is mar-

ra n ty. Should a m alfunction be suspected, co ntact your

s e llin g dealer or the ETO service department mith f u ll

d e ta ils of the d iffic u lty before attem pting re p a irs or

return fo r a e rv ice .

This m arranty does not extend to any of our products mhich have

been subjected to m isuse, n e g le ct, accid en t, in c o rre ct m iring

not our omn, improper in s ta lla tio n , or to use in v io la tio n of

s p e c ific a tio n s and in s tru c tio n s furn ished by us, nor to units

mhich have been rep aired or a lte re d outside our fa c to ry , nor in

cases mhere the s e r ia l number th ereof haa been ramoved, a lte re d ,

or defeced, nor to u n ita used m ith accessories not manufactured

or recommended by us, nor to the high pomer tran sm ittin g tu b e (s ).

Transm itting tubee are marranted by th e ir m anufacturer and the

m arranty is adm inistered by ETO.

This marranty is in lie u of a l l other m arranties expressed or

im plied and no rep resen ta tive or peraon is authorized to assume

fo r ETO any other lia b i li t y in connection m ith the sale of our

products.

ETO reserves the rig h t to make such changes or improvements to

it s products mhich i t may deem d e sira b le , m ithout o b lig a tin g

it s e l f to make such changes or improvements a v a ila b le fo r it s

p revio u sly manufactured products.

EHRHORN TECHNOLOGICAL OPERATIONS, INC. BROOKSVILLE, FLORIDA

- -

5ECTI0N

INSTALLATION

1. Unpacking i Open th9 marked end of both outer and inner cartons

and c a re fu lly remove the plastic-tiirapped a m p lifie r. If d i f f i 

cu lty is experienced, it may be necessary to also open the op

posite end of both cartons so th at the u nit may be pushed out.

SAVE ALL PACKING MATERIAL FOR RE-USEi ANY SHIPMENT OF THE ALPHA

77 IN OTHER THAN FACTORY-DESIGNED PACKING MAY VOID THE WARRANTY.

C a re fu lly inspect fo r shipping damage. Remove the sin g le screui

securing the top cover and s lid » the cover open. REMOVE THE FOAM

BLOCK WEDGED BETWEEN THE PLATE COIL AND THE AIR EXHAUST ASSEMBLY.

To insure th at the BB77 a m p lifie r tube is prop erly seated in it s

socket, grasp the s ta in le s s s te e l anode clamp rin g securing the

bottom of the rad silico n e rubber a ir exhaust hood and preas firm 

ly domnmard. The hood should be amooth and free of m rin kles.

Make certa in that the vacuum va ria b le ca p acito r (in the lomer,

right-hand corner of the r f compartment) ia aecurely fastened and

operates smoothly mhen the "TUNE" crank is ro tated .

In the event of damage, n o tify the tran sp o rtatio n company immedi

a t e ly . Complete and m ail the m arranty re g is tra tio n form to ETO

m ithin 5 day at no marranty c la im (s ) can be considered otherm ise.

Cloae and fasten the top cover, confirm ing that it a re a r lip con

ta cts and actuates the a-c in te rlo c k near the cool a ir in tak e.

. P h ys ic al In s ta lla tio n ! The ALPHA 77 must be located so that

intake of cool a ir and exhaust of hot a ir behind the rear panel

is not impeded in any uiay, and so th at hot a ir exhaust m ill not

s ig n ific a n tly re c irc u la te in to the cool a ir in tak e. Under no

circum stances should the back of the a m p lifie r be less than six

inches from any m all, d ra p eries, or other o b stru ctio n s. A two-

inch copper "bend” or elbom, e ith e r ^° or 45° "DfflV" type as

a v a ila b le from plumbing supply houses, may be used to d e fle ct

the exhaust a ir floui if necessary.

Room heating may be v ir t u a lly elim in ated as a by-product of

a m p lifie r op eration, and cooling system noise even fu rth e r cu t,

i f exhaust a i r is ducted outdoors using a s u ita b le duct not le ss

than three inches in in side diam eter. S ig n ific a n t back pressure

must not be generated! e le c tric dryer vent fit tin g s uiith magnetic-

la tc h in g outside fla p s , fo r example, are in to le ra b le , as they

m ill prevent adequate a ir flow and may re s u lt in seriou s damage

to the tube and the a m p lifie r. Normal blouier speed should be

increased s lig h tly mhen exhaust a ir is ducted more than a fetu

inches; check mith your d ealer or the E.T .O . fa cto ry fo r a d vice.

- -

5ECTI0N

INSTALLATION

1. Unpacking i Open th9 marked end of both outer and inner cartons

and c a re fu lly remove the plastic-tiirapped a m p lifie r. I f d i f f i 

cu lty is experienced, it may be necessary to also open the op

posite end of both cartons so th at the u nit may be pushed out.

SAVE ALL PACKING MATERIAL FOR RE-USEi ANY SHIPMENT OF THE ALPHA

77 IN OTHER THAN FACTORY-DESIGNED PACKING WAY VOID THE WARRANTY.

C a re fu lly inspect fo r shipping damage. Remove the sin g le screm

securing the top cover and s lid » the cover open. REMOVE THE FOAM

BLOCK WEDGED BETWEEN THE PLATE COIL AND THE AIR EXHAUST ASSEMBLY.

To insure th at the BB77 a m p lifie r tube is prop erly seated in it s

socket, grasp the s ta in le s s s te e l anode clamp rin g securing the

bottom of the rad silico n e rubber a ir exhaust hood and preas firm 

ly domnmard. The hood should be amooth and free of m rinkles.

Make certa in that tha vacuum va ria b le ca p acito r (in the lorner,

right-hand corner of tha r f compartment) ia aecurely fastened and

operates smoothly rnhen the "TUNE" crank is ro tated .

In the event of damage, n o tify the tran sp o rtatio n company immedi

a t e ly . Complete and m ail the uiarranty re g is tra tio n form to ETO

rnithin 5 dayai no uiarranty cla im (s) can be considered otherw ise.